Place a Gay Pride sticker on your homophobic buddy’s car. The joke only gets more amusing the longer the person doesn’t realize it is there. This works great for people that reverse into parking spots and tend not to walk around the back of their car.
Teacher or professor giving you a hard time? Grab their blackboard chalk and drill a small hole straight down from the writing end, insert a match, and fill the hole with a blend of chalk dust and glue. Put the chalk back and watch the panic when smokes starts to spew!
In countries that use speed cameras, park your car on the side of the road at night, preferably somewhere you can hide well. As cars pass you, take pictures with your camera, the flash will lead the drivers to believe they have just been caught speeding. Watch the glow of red lights as they slow down after realizing they just got a ticket for speeding. Too bad you can’t be there to witness the months of anxiety waiting for the non-existent traffic violation to arrive by mail to all these speeding drivers.
Park your car on a the street facing traffic, using a dark colour late model domestic sedan adds to the authenticity of this prank. Wear dark clothes and wear sunglasses and hold a hair dryer out the window and watch in delight as car come squealing to a halt as they pass you.
Superglue a quarter to the ground in front of a vending machine. Only time-lapse photography could truly show the ingeniousness of such a practical joke, but sticking around for an hour gives you a pretty good idea of how cheap people really are.
Microsoft Word and most likely a bunch of other word processing programs now come with something called AutoCorrect. When a common misspelling is made, it checks a list for it, and makes the corresponding correction. Example, it would change adn to and. The magic of this is that it is user editable! Hop onto your co-workers workstation, load up their word processor’s AutoCorrect list, and let your imagination run rampant. First start with the small, but most aggravating ones by reversing what is already in the list, change the corrections to the misspellings! Then move to even more humorous stuff like company acronyms, people’s names, it’s endless! Then watch to see how long it takes before they switch the blame from their own typing, to the word processor, and eventually to their sick minded co-worker… you!
This practical joke is best done to people who are truly anal about their car, truck, whatever. The type that parks their car 20 hectares away from the mall to avoid it getting touched by human kind. When your buddy leaves the car, get your friend to place a note on the windshield that reads Sorry, about the scratch. We will take car of any damage. and add a fake phone number. Then as you come out with your buddy from the mall, and they read the note, let the search for the non-existent scratch begin. You can help by point out potential scratches, watching him or her run over to see, only to realize it’s just dirt. This one can done from afar so that you can have practical fun watching the owner of the survey for damage rather than you helping out, can be even more hilarious.