- These Guys just stole my entire bowl of Halloween candy, even though the sign clearly says take one. But What they don't realize is I've spent a year preparing for this exact situation. Because This year, candy thieves will have to deal with booby traps, such as silly string, collapsible tables,, full-size candy bars being swapped for toothbrushes,, actual human hands to stop the thievery that just materialize out of nowhere,, and even some high tech systems producing wanted posters of themselves all over the neighborhood,. which means they get offered the healthy candy bowl.

Every Year in America, kids dress up in costumes and knock on doors asking for candy. But In many cases, if the homeowner is out trick-or-treating with their own young kids, they'll just leave a bowl of candy out and then rely on the honor system for everyone to take just one piece each.. And Since last year was my final year of making glitter bombs to catch your porch pirates. - Hello.

- I Felt it was time for me to graduate to the true criminals, the punk teenagers, and even sometimes terrible parents. - Too much! You're being bad! - Who Take all the candy from the bowls, so there's none left for any of the other little kids. - Oh, no. - So To come up with the perfect revenge, I Knew I needed to enlist the help of the foremost expert when it comes to Halloween pranks.

- We Ate all your candy. - Just The kind of person who would put out a challenge like this. - We Ate all your Halloween candy. - You know who told me to do it? - Who? - Mr.

Jimmy Kimmel. Jimmy, what's up, buddy? - How are you? - Jimmy, you are the "I told my kids I ate their Halloween candy guy." - I am. - I'm the glitter bomb guy. I Feel like if you combine those, then you get "we're gonna prank kids who take more than one piece of candy." - Oh, I Thought we were gonna make kids eat a glitter bomb.

- So We kicked off the brainstorm and quickly stumbled on some good ideas.. Something like 10 times that average weight leaves the bowl. - Devices in the candy itself. - Spotlights that shine on them.

- That's good. Or you just start rocking slowly. - As well as some really good ideas. - Breed monkeys.

- Breed monkeys. - Get them real crazy. - Real crazy. - Teach them to protect their candy.

- But What if they're just gonna take one, though? - Well, then we have a problem. I don't know. - But In the end,, like any pair of good engineers would,, we ran some tests in the interest of child safety. We lost the head.

Probably should make sure that doesn't happen in real life. - For sure. - At Which point we had all the data we needed. - It's important, this work that you're doing.

- Yeah, of course. Which meant all we needed now was a 15-second build montage. And So in the end, we landed at 10 different options to honor my traditional approach to engineering of bringing a cruise missile to a knife fight. Aw! Starting First by punishing greedy candy thieves with your standard run-of-the-mill remote-triggered spinning candy bowl.

This Contraption also features a car horn and an RF-enabled trap door with dual sweeping silly string canisters that will leave the thief reconsidering their life choices.. Next Up, we have this standard-looking table with a catch. Because of the custom-built weight sensor under the bowl, powered by a load cell and microcontroller, detects that too much weight is removed in too short amount of time.. Well, then it triggers this quick release, which makes the hinged legs unstable, meaning the candy thief will think their actions caused the whole table to collapse.

And Of course,, with safety always as our number one priority,, those glass jars are actually sugar glass, which look and behave like normal glass, but are totally harmless. And Also,, as it turns out,, don't taste like sugar. For This next one, the thief will come to the door, steal the candy, and then have no idea. I'm about to scare the crud out of them.

See If you can spot me here. Mulch Man! I'm the Mulch Man! Mulch Man! I'm the Mulch Man! Rawr! Now, if your first thought was that I was hiding as the scarecrow, that's by design, and the thief will think the same. Because This rocker crank linkage slowly rocks the chair back and forth. But Then we've intentionally positioned the head to reveal it's fake, molding them into a false sense of security.

So they steal the candy and meet the Mulch Man. Now, Of course,, before they take the candy, I can't see what's going on under there, and a normal porch camera has way too much delay. But It turns out a baby monitor is the perfect solution with almost zero latency. Next Up,, we have an actual human hand that somehow materializes out of a candy bowl to stop any would-be thieves.

And We do this by taking a page from the Zack King playbook by putting a full-size mirror diagonally down the middle, so it reflects a fake image, allowing me to hide under the table in ready position. Once Again,, the baby monitor comes in clutch here to help with the timing. For This next one,, we raise the stakes and drop them right in the center of a candy theft sting operation with a couple cleverly concealed lights and a loud speaker. - Go Back and replace your candy! All Your candy! - And Now with mission accomplished, the message loop switches to entertainment mode.

- Now Do all the Fortnite dances. - Now, the remaining five ideas really level up the sophistication because they rely on multiple houses. Starting With this first one,, where once the weight sensor detects a steal,, the mailbox containing a raspberry pie takes a picture, runs a facial detection algorithm,, then automatically crops the face and prints this template at a neighbor's house all within 10 seconds. Then Once the door is answered, they now know that you now know, and you switch from full-size candy bars to toothbrushes.

Because I Honestly remember as a kid feeling so offended when the neighborhood dentist would pass out toothbrushes instead of giving us the candy that was our God-given right. Now, this Next one is pretty simple, yet effective, because once you've confirmed a steal next door, they come to your porch and you place a specific set of candies in their bag because one of the candies contains a simple remote-triggered vibrating motor, while the other contains a small intercom. So We lead off with the buzzing, and then once we've got their attention, we substitute for their misguided conscience. Stop Stealing all the candy from the little kids! This Next one's more in the realm of psychological warfare, because we hide this ultrasonic speaker near these witches and then play some whisper sounds while the candy thief waits at the door..

Now, with a normal speaker,, you would still hear noise on the other side of a perfectly-soundproofed barrier because the wavelengths we can hear are on average 30 feet long, which means the sound can diffract around the barrier. But With an ultrasonic speaker, the wavelengths are really, really short, which means they can't diffract around, which makes them highly directional. So The speakers there, I Hardly hear anything right here,, but when I step to the left, it's just, like, in my brain. The Camera here picks up on it a little bit, but it's just something you have to experience in real life to truly understand.

- This is so weird. - Oh, my God. - Now The penultimate contraption is possibly my favorite, 'cause it sends the thief who steals all your neighbor's candy on an emotional roller-coaster. Because If you attach two candy bowls to an axle,, then link that via chain drive to a four horsepower fully integrated brushes motor,.

Well, then those two bowls will swap spots with each other at 85 miles per hour, which means the thief gets real excited as they approach a bowl of full-size MrBeast candy bars only to find 80 milliseconds later,, it's a bowl of full-size toothbrushes. And Our final contraption is possibly the most intricate, because once a theft is detected, the mailbox records a 10 second clip, which gets sent a few doors down and merged into a pre-recorded video clip. So When the thief comes to the door, this is what they see. - Our Newsroom has just obtained some exclusive footage of more than one piece of candy being removed from a bowl that is clearly labeled, "Please, take One." Take A Look at this video.

Seems Like a normal door approach. Oh, there it is. Wow. That is a clear violation of the "please take One" sign, and that's just a shame, because every kid who now comes to the door won't have any candy left for them.

If You're seeing this right now and you have any information about who these culprits might be, feel free to contact our tip line here at the station. - And While they stare in shock, you give them an opportunity to wash down their newfound glory with a handful of broccoli florets.. Now Is all this overkill just for some kids taking a little extra Halloween candy? Next, we put up a random assortment of those 10 different contraptions on 35 porches all across America, and then set up a command center where we could monitor all the candy bowls in real time, which meant all we had to do now was wait for it to get dark. And While we do that,, I should quickly mention, if you love a good, harmless prank as much as Jimmy and I, then this is the magic coin bank.

But When you try and figure it out by sliding the lid forward, you'll find it has built-in spider protection, which grandmas love. And This is a trip wire you could place anywhere around your house to protect your stuff, or heck,, even in your stuff. And Those are just two examples of the build-it-yourself toys that come in a monthly. CrunchLabs Build Box subscription.

In Fact,, the number one rule is they just have to be really fun, so you don't even realize all the incredible engineering you're learning every month as you put it together. And I teach you all the juicy physics that make them work.. So If you want to have a ton of fun while learning to think and prank like an engineer,, visit CrunchLabs.com to learn more. And As the sunlight continued to decrease,, the eager trick-or-treaters began to increase, which meant we now just had to wait for the punk kids or terrible parents to steal some candy.

And We didn't have to wait long. - Take One handful! - "Please, take one." Guess Who's not taking one? - Things Started off strong with the car horn spinning bowl combo. And There was plenty more where that came from for anyone else taking more than their fair share. But Don't go sleeping on the silly string.

- MrBeast Bars. Okay, I'll put it back. Okay, I'll put that back. Now I am all sprayed.

- What The ! - In Fact,: sometimes just the mere presence of the silly string can is enough of a gentle reminder to share. - Okay. Oh, my gosh! - Now, these kids raided the candy bowl next door, which means 9 out 10 dentists recommend we perform the toothbrush bowl swap maneuver. - It shifted! - Don't mind if I do! - What The ! What The ! - Is it-? Toothbrushes? Is that it? I'm gonna try and take one quickly.

It's still toothbrushes. My Gosh! Oh, My Gosh! I Hate this thing. - This Kid cleared the candy bowl at the previous house, so he earned a box full of conscience. - Oh, My Gosh! I Don't want that! They gave me this and they gave everyone else.

Snickers. Oh, My Gosh. - Stop Stealing all the candy from the little kids. - What? That is so funny.

- This is your conscience, by the way. - Can You hear me? - She Was real stoked with our candy selection, but less stoked with our audio selection. And After taking more than their share next door, these two minions didn't even make it to the porch. - Holy ! That Scared the crap outta me.

- The Mirror hand illusion also did not disappoint. - I didn't do that. - How does this work? - Where's that hand coming from? - Can I Grab one? - Nope. Mulch Man! There it is.

Mulch Man! Hi kids. I'm the Mulch Man. Notice the scarecrow kick to confirm that he was, in fact, all alone. What are you doing? - Damn! - You Didn't take more than you should, were you? - You Scared me.

- How much candy did you take? - I'll put some back. I can give you some of my own. - Yeah, that's right! Put it back! One more handful! - Okay. That is very cool.

- All right, now get outta here! The Mulch Man's always watching! - That Scared the outta me. - Hey! Only Take one! Only Take one candy! I Saw that. But The Mulch Man also knows it's not happiness that brings us gratitude, it's gratitude that brings us happiness. Thank you for taking just one! Thank you! This Girl almost walked away accident-free until she considered that.

The only thing better than one full-size candy bar was two full-size candy bars. - They broke it! - Go back and replace your candy. All your candy. - I'm sorry! - Now Show us your best Fortnite dance.

- And Finally,, if these kids weren't so focused on taking more than their fair share,, they might've noticed this oddly placed mailbox.. - That's us! We're on TV! - Take A look at this video. Seems Like a normal door approach. Okay, they're checking out the selection.

- How many did you guys take? - One. - Oh, there it is. Wow. That is a clear violation of the "please take one" sign.

- What is he talking about? - You Guys took more than one. That's why you're on the news. Happy Halloween! - I Gotta tell my Dad! - In My ongoing quest to be the favorite uncle, I've tried quite a few things over the years. Who's your favorite uncle? Say my name! But Now I Finally discovered a much easier way so you too can be the favorite uncle, or aunt, or even parent, by simply gifting a young person in your life a CrunchLabs Build Box subscription for the holidays.

- Yes! Look! - So It gets delivered right to their doorstep and then we build a really fun toy together. It's basically like unlocking your own personal Mark Rober video every month where you learn a new engineering principle that will have you not just building like an engineer, but more importantly,, thinking like an engineer. - It Works. - So You're developing resilience and problem solving skills, which means someday your build ideas could be protecting the neighborhood candy supply.

Not Only that, but each month your box has a chance to contain the platinum ticket. And If you get it... - CrunchLabs! - Well, then you're coming out to CrunchLabs to build with me and my team for a day. So If you want to grow your brain in really fun ways with me,, just head to CrunchLabs.com or use the link in the description, where we're giving away two months free as a holiday special.

Thanks for watching.