If you want to pull a prank on someone without causing permanent damage, but looking as if you have...
Get a 250 liter (55 gallon or so) garbage can, or something pretty large. Put it in an appropriate place. Fill it up with water. Drop in a block of Dry Ice (about 25 Kilos or 50 pounds), or as much as you can muster up if you can't get a full block. In the US, a block of Dry Ice is pretty inexpensive.
It will start bubbling furiously. Now, if you are in the US, pour in a bottle of Dove dishwashing soap, if elsewhere, washing up liquid, the sudsiest possible! It amazing how many bubbles can be produced by a single bottle of dishwashing liquid!!! (If you are really in an obnoxious mood, use 4 or 5 bottles of that bubble blowing soap - they last longer!)
We did a great prank on a friend once. He was an Elvis Impersonator, and often did performances, and always drove a restored classic car, painted pink, which was his pride-and-joy Elvis-mobile. We set up a plank on step ladders over his car, placed a low, flat, wide water container on it, filled it up, poured on the soap, dry ice and *pink* food coloring on his lawn about 5AM. (we had to be very quiet about this!)
About 45 minutes later, a lady called him up anonymously, telling him that he car was being eaten by aliens (We told her to say a h-u-g-e Blanc Mange, but unfortunately, she couldn't without cracking up into laughter, so she used aliens.) Of course he thought it was a prank call, but when he looked out the window, all he saw was a H-U-G-E pink pile of bubbles swallowing up his car! He nearly had a heart attack! ;-)
For the *mean spirited*, this works very will in a house. It will fill up a room with bubbles! Caution as it will damage things that are prone to water damage. Its nearly as good a trick as filling a house with popcorn, which takes a lot of effort! Some fellows supposedly went out a dorm window onto a narrow ledge and into an adjacent room. There they hung the bed frame out the window by a rope, tied the other end to the door knob, removed the hinge pins, and exited as they had entered.
Even without the pins, the hinges held the door in place till the occupant of the room returned, inserted his key, turned the handle, and watched his door fly across his room and out the double window, taking the window frame with it. The perpetrators said the look on his face was worth the cost of the repairs.
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