South Park collects some of its most memorable holiday episodes – wholly appropriate, since the entire South Park series and phenomenon sprouted unexpectedly but virally from a Christmas holiday short film, distributed on VHS in a sort of pre-You Tube frenzy. Starting this afternoon, a lot of them are shown, back-to-back, throughout prime time. That’s a lot of Mr. Hankeys, so don’t poo-poo this Christmas mini-marathon’s popularity.