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S6, E14: As punishment for a prank, Bart must assist Principal Skinner with his astronomy. He discovers a comet, whichturns out to be on a collision course with Earth. Springfield residents pile into Ned Flanders' bomb shelter,but when there isn't enough room inside, they pile out – and watch the underwhelming comet destroy only the bomb shelter, nothing else.
Animation · Feb 5, 1995 · 21 min