A practical joke is practical because it consists of someone doing something physical, in contrast to a verbal or written joke. For example, the joker who is setting up and conducting the practical joke might hang a bucket of water above a doorway and rig the bucket using pulleys so when the door opens the bucket dumps the water. The joker would then wait for the victim to walk through the doorway and be drenched by the bucket of water. Objects can also be used in practical jokes, like fake vomit, chewing gum bugs, exploding cigars, stink bombs, costumes and whoopee cushions. Practical jokes often occur inside offices, usually to surprise co-workers. Covering the computer accessories with Jell-O, wrapping the desk with Christmas paper or aluminium foil or filling it with balloons are just some examples of office pranks. Practical jokes are also common occurrences during sleepovers, whereby teens will play pranks on their friends as they come into the home, enter a room or even as they sleep.

American humorist H. Allen Smith wrote a 320-page book in 1953 called The Compleat Practical Joker that contains numerous examples of practical jokes. The book became a best seller not only in the United States but also in Japan. Moira Marsh has written an entire volume about practical jokes. One of her findings is that in the USA they are more often done by males than females. (source : wikipedia)

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