Twenty years ago, Lisa Simpson had a change of heart about eating meat and became a vegetarian in an iconic episodes of “The Simpsons.” Featuring an epic cameo from Paul McCartney, the episode has been hailed for taking vegetarianism mainstream.

HuffPost Live spoke with the episode’s executive producer, David Mirkin, and other “Simpsons” aficionados to commemorate the anniversary and discuss the episode’s significance. Check it out in the video above.

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