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*This prank happened at the Harvard Football field a couple years ago. Taking a page from the playbook of behavioral psychologist Pavlov, an MIT student spent one summer training hundreds of pigeons to flock to the Harvard field whever they heard a referee's whistle. The student did this by going to the field every day to blow a whistle as he scattered bird seed all over the field. Eventually, just like Pavlov's dogs, the pigeons learned to associate the sound of the whistle with the promise of food. When Harvard's football team eventually came back to train during the fall season, they found that just one whistle-blow would cause hundreds of pigeons to descend onto the field, making the field unplayable. == Attempted Pranks == ''Please include only pranks that were actually attempted, and not merely planned. Sure, we've all imagined awesome pranks -- the list of those would be endless -- but the real thrill of hearing a good prank story is being, in your mind, with the people who carried it out.''