In the February 2003 episode "Barting Over", Bart claims he does not recall being in any commercials in the past, and then eats a Butterfinger just as he did in the commercials.
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Similar to Whoppers and Maltesers, they were roughly the size of marbles and sold in bags as well as advertised by the Simpsons.
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Reacting to this, the January 2002 Simpsons episode "Sweets and Sour Marge" included a scene depicting Butterfinger bars as nonflammable; the character Chief Wiggum says, "Even the fire doesn't want them."