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.

A practical joke is a mischievous trick played on someone, generally causing the victim to experience embarrassment, perplexity, confusion or discomfort. A person who performs a practical joke is called a practical joker. Other terms for practical jokes include prank, gag, jape, or shenanigan.

Practical jokes differ from confidence tricks or hoaxes in that the victim finds out, or is let in on the joke, rather than being talked into handing over money or other valuables. Practical jokes are generally lighthearted, reversible and non-permanent, and aim to make the victim feel foolish or victimized to a degree. However, practical jokes performed with cruelty or as par (source : wikipedia)

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