December 31st is the very first day in which Futurama is set. On New Year's Eve, 1999, Philip J. Fry goes on a pizza delivery to Applied Cryogenics where Nibbler, using the false name of I.C. Weiner, ordered a pizza so he could push Fry into a Cryogenic tube. This worked and Fry found himself in the year 2999 on New Year's Eve.

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