prank

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A mischievous trick or practical joke.
• transitive verb To decorate or dress ostentatiously or gaudily.

from The Century Dictionary.

• To decorate; adorn; deck; especially, to deck out in a showy manner.
• To adjust; set in order.
• To present a showy or gaudy appearance; make a brilliant show.
• To be crafty or subtle.
• noun A playful or mischievous act; a trick played sometimes in malice, but more commonly in sport; an escapade; a gambol.
• noun Synonyms Whim, etc. (see freak), antic, vagary.
• Frolicsome; mischievous.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb To make ostentatious show.
• noun A gay or sportive action; a ludicrous, merry, or mischievous trick; a caper; a frolic.
• adjective obsolete Full of gambols or tricks.
• transitive verb To adorn in a showy manner; to dress or equip ostentatiously; -- often followed by up. See prink.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun obsolete An evil deed; a malicious trick, an act of cruel deception.
• noun A practical joke or mischievous trick.
• verb transitive To adorn in a showy manner; to dress or equip ostentatiously.
• verb transitive To perform a practical joke on; to trick.
• verb transitive, slang To call someone's phone and promptly hang up
• adjective obsolete Full of gambols or tricks.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb dress or decorate showily or gaudily
• noun a ludicrous or grotesque act done for fun and amusement
• noun acting like a clown or buffoon
• verb dress up showily