The first summer the producers reached for a high-school sorting hat. Thirteen houseguests walk into the Studio City compound and get split on Day One into four cliques — athletes, brains, off-beats, populars — that govern the early HoH and nomination math. The twist front-loads the alliance lines before the cast has had a night to read the room. Worth the watch for the moment Big Brother starts treating its conceits as social frames rather than mechanics.
Slot #14 of 26 in the Big Brother Editor's Canon. The seasons on either side show what I ranked it against.