Los Angeles Times

Photo Gallery: Caltech's annual pumpkin drop

After the streets were clear of trick-or-treaters and parties were winding down, a group of Caltech students were pushing crates of frozen pumpkins up the elevator in Millikan Library. As part of a Halloween tradition dating back to 1972, five students climbed a ladder to the tallest point of the roof and prepared to launch the pumpkins, frozen in liquid nitrogen, off the side of the nine-story building.
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