My favorite ending in a film would have to be the Prestige with Christian bale and Hugh Jackman. I think the story was great but the ending was really insane ad theirs a lot of room for interpretation. The revelation was that Angrier (jacks character) was making clones of himself every night he performed and his clone would die after every performance. Its symbolic in that his wife drowned in an act as well. I think it was done on purpose, every night he dies, essentially his clone the same way his wife did. And for Cristian’s character he had a double and they shared their lives together, ultimately one died and it wasn’t the original character but the twin.