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From a Wikipedia article related to Fermats last theorem:

A sum, proved impossible by the theorem, appears in an episode of The Simpsons, "Treehouse of Horror VI". In the three-dimensional world in "Homer3", the equation 1782^12 + 1841^12 = 1922^12 is visible, just as the dimension begins to collapse. The joke is that the twelfth root of the sum does evaluate to 1922 due to rounding errors when entered into most handheld calculators. However, the equation is clearly incorrect as the sum of an even and an odd number is odd. In fact, the left hand sum evaluates to 2,541,210,258,614,589,176,288,669,958,142,428,526, 657, while the right hand side evaluates to 2,541,210,259,314,801,410,819,278,649,643,651,567, 616 — within a billionth of each other. A second 'counterexample' without the obvious flaw appeared in a later episode, "The Wizard of Evergreen Terrace": 3987^12 + 4365^12 = 4472^12. However, in this case, both 3987 and 4365 are divisible by 3 (and 9, for that matter), so that the entire left-hand side must similarly be divisible by 3; this is not true of 4472, and therefore not of the right-hand side.