What are some good pranks?

Well, after reading the Best practical joke EVER thread, it sparked my thoughts on this thread. Just list some good practical jokes/pranks.

NOTE: Please refrain from posting pranks that include any physical harm or serious psychological damage. (Or property damage that could result in getting my ass kicked :rolleyes: )
Here are some that I know (I got them from a practical joke site).

Spray a light coating of pepper spray (mace) on a roll of toilet paper (outside of course) and
let it dry. Install the toilet paper roll in the restroom of your choice.

Buy a rubber snake, and using fishing line, tape it to the toilet see lid.

Tie a knot in a straw in drink (under lid or in nonclear drink) when unattended.

Put pop-its under toilet seat.

Fill large garbage can with water in the winter. Let it freeze. Turn it upside down on the shoulder of the road and build a snowman around it. Make a big sign that the snowman holds to say “PLEASE Don’t Hit Me.” Watch to see the first rude driver to run down a solid snowman that asked to not be hit.

Attach a 32 oz. soda cup to the top of your car with a large magnet inside the bottom of the cup. As if you had left it there by mistake, drive merrily along with the radio LOUD so you can’t hear the people yelling to get your drink off the car. When they point and wave, act likethey are waving at you, smile and wave back. You would not believe the reactions to this intraffic. People will GET OUT OF THEIR VEHICLE and tap on the window to tell you about the cup!

While someone is not looking, place a small pin hole in the side of their coke can (or any soda can) just below where they drink. When they take a drink they will think they have “Spilled” some on them, this could go on for 10 minutes without them finding out. It’s hilarious to watch them as they wipe their chin after each drink.

A friend’s upstairs neighbor was physically abusing his girlfriend. Eventually, my friend convinced the girlfriend to kick him out of the house. But my friend decided he wasn’t reallysorry enough. So she took a color copy of her own Vermont state licence plate, and PhotoShopped it to read an obscene word starting with C and ending in Face. She then madetwo high resolution copies, and had them laminated. She then went to where this jerk was staying and superglued her mocked-up licence plate OVER his real ones. As no one really checks their own licence plate, he was driving around for two weeks with women flipping him off left and right, honking everywhere. He had no idea why, until the cops pulled him over. --(Jacked from the thread http://boards.straightdope.com/sdmb/showthread.php?t=240268)

I think those two pranks go against your own rules.

I come from a family of pranksters and I have learned the golden rule of pranking:
In the end, if the prankee doesn’t laugh about it, the prank has failed.
This means that pranks must not involve either damage or humiliation. It also means that the prankster has a responsibility to choose their victims carefully.

The aluminum foil prank from the linked thread was amazing.

The first working computer program I ever wrote was a fake virus I planted on my father’s computer. This was circa 1988-89, and at the time he was completely obsessed with having his precious computer destroyed by a virus. It caused the screen to go black and display the following message: “hard disk terminated at: 1%” As the precentage increased, I had the program continually accessing a temporary file so that the hard drive would be making noises. I followed that up a few months later by simply typing: “Your computer has successfuly been trashed. Have a nice day. -Virusoft” at the DOS prompt. I didn’t think he’d fall for that one, which is why I was quite surprised to hear a gigantic aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaarghhhhhhhhhhhhh coming from his office.

A colleague told me that she and her daughter took some cotton balls, dipped them in chocolate, and offered their new “homemade candy” to her husband. I expanded upon this with Papa Zappa by also dipping some real marshmallows - I made sure he got a real marshmallow first, then offered him a fake. Dunno how I managed to keep a straight face until he bit into the fake, but his bellow of outrage was totally worth it.

About that same time, I lived near a shop that (at Eastertime) sold candy eggs. The eggs consisted of a hard white shell with a layer of dark chocolate inside, and looked shockingly realistic. I would bring an egg with my lunch at work, tap it on a table to demonstrate to the crowd that I had a “real” unshelled egg - then ostentatiously bit right through the shell… while watching jaws drop. A friend took that one step further: she did this in front of her boyfriend, explained the joke, and handed him one to enjoy also. But she handed him a real egg, raw.

I like this rule. To me a pranks should be about having fun.

Currently I’m playing a rather involved prank on a friend. He was driving down the road and saw a sign that said “You will find God at the end of the road.” He says he went to the end of the road and God wasn’t there. We thought it would be fun to send him postcards from all over the world with the phrase “You will find God at the end of the road” in the native tongue. And maybe some additional phrases like in English: “I waited for an hour, where were you? God” Or “The road is longer than you think” He is currently going nuts trying to figure out who sent the one from Spain. We have others arriving. Eventually, we are going to start sneaking religious paraphanalia into his life as well. A cross hanging from his rear-view mirror. And some other fun stuff.