The Simpsons will be marking a milestone this weekend.

Fox, 8 ET/PT) —The Simpsons, in its 23rd season, will hit 500, a nearly unheard-of milestone reached by only two other prime-time scripted series Gunsmoke (635) and Lassie(588).

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“I never imagined this,” creator Matt Groening says. “I thought it would be a hit with kids. I wasn’t sure adults would dig it.”