I propose a change: That this activity be renamed practical-asshole joking.

* False signalling, such as a 'kick me' note stuck on someone's back, an 'automatic door' sign on a normal swinging door, or dropping an empty carton on someone's foot after pretending it is heavy;
* Removing someone's clothing so that it exposes a private body part or their undergarments, particularly in public;
* Surprise disruption, employing (for example) trip-wires, whoopee cushions, peanut butter on the inside of a car door handle, punctured ketchup packets under the toilet seat, or a three-legged podium for a public speaker;
* Visual deception, such as water-filled balloons, plastic wrap on a toilet seat, 'apple-pie beds' which have had the top blanket artfully folded back so the victim cannot get all the way in, loosening the tops of salt shakers, causing its entire contents to spill on one's meal, fake flowers in the lapel which squirt water, rubber fruit and guns which unfurl a flag saying 'bang';
* Fool's errands such as sending someone to buy striped paint, water-proof towels, or read-only CD blanks (see also: snipe hunt);
* Hoax stories or situations perpetrated on or by the media such as fabricated UFO landings and fake celebrity interviews involving rude or ludicrous questions (see also: culture jamming);
* Spontaneous impersonations, such as taking an order for takeaway food from someone who has actually dialed a wrong number;
* Verbal and typographical pranks, such as printing a block of text so that the first letters of every line spell out an irreverent message (see also Acrostic), or teaching someone a purportedly useful phrase in another language which transpires to be an insult (such as "Tu es une vache", which means "You are a cow" in French.)
-http://en.wikipedia.org/wiki/Practical_joke