This Troper has done this to himself by accident several times. He remembers the endings of television series from when he was a kid, although he doesn't remember most of the characters and actions (although they come back to him after watching some series). Some examples: ''BattlestarGalactica'' arrives to Earth, finds it still back in technology, gravity is lower so they can fly, and they go into an ecological frenzy.
Oh, and on the way there, they're visited by all kinds of aliens. ''BabylonFive''? EverybodyDies (eventually), the future
gets worse, and then ''EverybodyDies''... like... everybody... When you only remember that, there's little use in watching the 5+ series knowing most of what they do is in vain because HumansAreBastards and screw up everything in the last episode (and incidentally last million years) anyway.