Happy 20th birthday, South Park! Since its premiere on August 13th, 1997, creators Trey Parker and Matt Stone have given the world singing excrement, stoned towels, a sensitive Satan, characters with names like Big Gay Al and Tweek Tweak, farting Canadian comedy duos and some of the most scabrous celebrity parodies imaginable. And two decades after Cartman's first alien anal probe, the animators still refuse to play nice or tow anything even resembling P.C. line. How many shows do you know that could come up with something as biting as the "Memberberries" concept – one of the sharper takedowns of how a nostalgia-worshipping culture can slide into dodgy territory – much less in its 20th season?

A decade ago, we attempted to single out the 25 most memorable (and memorably jaw-dropping) highlights of the show. A lot has happened to Stan, Kyle, Cartman and the indestructible Kenny since then, however, so we've updated and substantially revised our old list – to paraphrase a wise man, respect our au-thor-i-tiiiie on this. These are our picks for the best South Park moments to date. It's been a remarkably consistent middle finger to cultural propriety for the 20 years. It feels like it could keep flipping the world the bird for another 20 more.