Otto Maddox wrote: Really simple one that the wife will love - rubberband the kitchen sink sprayer so it is on. Point it straight outward. Your wife goes to the sink, turns it on, gets soaked, and you get a good laugh and a wet t-shirt show. Fun will be had by all.
This happened at every party I went to during high school, that the parents were not supervising. Photos hanging on the wall and furniture also got rearranged.
nicksta43 wrote: I always liked the classic zip tie around the driveshaft gag.
speaking of wrapping stuff around stuff.
one time i was driving at night and all of a sudden i hear a loud "thump-thump-thump-thump...." sound so i immediately pull over. this was in a neighborhood
turns out some kids laid some duct tape across the road, sticky side up, and it continued over to the gutter pan it where was rolled up into a ball of duct tape, maybe the size of a baseball. Stuck to my tire then got all caught up and made a racket. I heard kids laughing and running away.
I was mad for a second and then I had to laugh, surprised that I didn't do that when I was a kid.
We would take test syringes full of water and inject the seat foam of certain office chairs. If you do it right and depending on the type of upholstery, it's not obvious that something is amiss. The good news is that most people don't want to chase you far when it looks like they have peed themselves. 
A fried at worhk bought a Highlander and was amazed that it displays the tire pressures on the dash. Being his only friend that knows cars he would call every couple days to comment on this automoive version of witchcraft were the cars and tires talk. He even called on vacation to tell me how much pressure he gained on a long drive.
For the past few weeks when he calls of on his lunch break one of us would let a couple pounds of air out of a tire. He's been complaining that a brand new car shouldn't have five leaky tires. The past few days I've been bringing an air tank. Now he's really confused how the air comes out of one tire and goes into the spare.
Around here, people seem to hate letting their phone ring for more than 2 seconds and will snatch the handset pretty quickly when it rings. These phones have shiny black phone cords. Coincidentally, we also have shiny black zip ties used everywhere in the plant. We zip tie the cord to itself extremely close to the handset and wait.
It's hilarious to come around the corner to see someone having a conversation with a supplier and holding an entire phone to their face 
We used to sneak into Officers' Country and put black shoe polish on the toilet sesats. Warm butt melts the wax, a big ring goes home with him.
My dad told a few that occurred at work. He worked in a railroad line repair shop.
The men became aware that the desserts were disappearing out of their lunch boxes. A watch was set up to find out who the culprit was. He was finally spotted and one of them men prepared a fine looking chocolate pie filled with exlax. After he recovered, the theif never stole desserts again.
On another occasion a man threw an old pair of boots in the trash can. The next morning they were there again. He threw them away again. They returned the next morning. He removed them and walked out to the RR scrap pile and threw them in two different directions as far as he could. The next morning they were screwed to the floor of his locker. My dad said the poor guy went totally off his rocker and had to be tackled and restrained for a while.
One more: In the 50s it became popular to paint a real Christmas tree. One of the men in the paint dept. brought his in and sprayed it silver and left it to dry. During the day a co-worker kept spraying green lightly in different spots. The tree's owner would see it an deciding it was bleeding green back through the silver would re-spray it. IIRC dad said he took a green tree home that afternoon.
Ever put packs of mustard under the buttons on a ladies room toilet seat?
Neither have I.
In reply to 914Driver:
No, but I've also never put ketchup packets underneath the feet of desk chairs either
Back in high school (80's) in print shop we had revolving darkroom doors like this;
When the teacher went inside we would spin the opening back to the outside and stick a stool in the opening. Of course that would prevent the door from spinning and effectively lock him in the darkroom for the remainder of the class. Shortly before the bell rang we would remove the stool and all be out the door before he would emerge from the darkroom.
A guy I worked with told this one: he had a neighbor who bought a VW Bug (this was back in the aircooled days) and the guy was bragging about the gas mileage. So my bud snuck over and started siphoning a couple gallons of gas every other day or so. The bragging stopped immediately and the car went in the shop for a couple of days. When it came back out, he siphoned a few more gallons, waited a week or so...
...then started putting it back in. 
He drove this guy NUTS.
But prank gone bad? A co worker at a parts house had a habit of sneaking up behind people and very quietly removing their chair or stool. The victim tries to sit and much hilarity ensues. Well, except for the guy who went over hard, landed on a concrete floor and broke his coccyx. 
DuctTape&Bondo wrote: On the flip side, I came back to work after a long weekend in Vegas to find my desk covered in Just Married decor and later came out to find my car done up the same.
My parents have a story like that that went freakishly right. They had just started dating and my uncles wrote "Just Married" in the dirt on the back window of my dad's car (lots of gravel roads in rural Wisconsin back then appearantly). Neither of them saw it, but my dad got pulled over for speeding (not the first or last time) on that date and the cop saw it when walking up and just told them "congradulations on your marriage" and walked away. They were highly confused until they saw the back window and knew exactly who to blame! Other than the awkwardness for newly dating people, they were cool about it because it got them out of a ticket.
Epic prankwar:
http://www.collegehumor.com/prankwar
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