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The Simpsons — Season 12, Episode 9

HOMЯ

Season 12, Episode 9 • Aired 2001-01-07 • 23 min
While working as a human guinea pig (to pay off the family's lost savings after making a bad investment), Homer discovers the root cause of his subnormal intelligence: a crayon that was lodged in his brain ever since he was a boy. He decides to have it removed to increase his IQ, but discovers that being smart does not necessarily equal being happy.