The Cellar - Pranks

From The Economist of 20 Dec 2005:

Quote:

From Hermes to bonsai kittens
Mr Hoffman and his fellow "Yippies" showered the floor of the New York Stock Exchange with dollar bills in 1967, thereby managing to stop the tickertape for six minutes while traders scrambled to pick up the notes. ...
Students at Yale scored a big victory during last year's football match against Harvard when they passed out pieces of paper to thousands of fans on the Harvard side of the stadium. The fans were told that, when held up, the bits would spell “Go Harvard”. In fact they spelled something else (see photo that opened this article).

http://www.economist.com/images/20051224/5205PP1.jpg
... we invite readers to nominate their contender for the finest prank in history, explaining in 750 words why it deserves the title, to reach us by January 20th. The three best entries will be announced in February and published on Economist.com. Entries, please, to pranks@economist.com.