30 Rock

30 Rock is the most joke-dense sitcom in television history. Tina Fey packed more laughs per minute into her fictionalized version of Saturday Night Live than any show before or since. The comedy arrives at a velocity that rewards — and practically demands — rewatching: cutaway gags, background signs, throwaway lines, and running jokes layer on top of each other in every scene. Alec Baldwin's Jack Donaghy is one of the great comedic performances — a corporate Republican mentor who is somehow the most competent and self-aware person in every room. Tracy Morgan, Jane Krakowski, and Jack McBrayer form a supporting cast so reliably hilarious that any one of them could carry their own show.