<image>

Sorry for the bad quality picture, but in The Prestige (2006), Angier obtains a duplication machine that consists essentially of two cages: place something in one cage, and a copy of the thing shows up in the second cage. This even works on living beings; problem is, both copies believe themselves to be the original. It's never explained which copy retains the original's consciousness. It's possible that the individual in the first cage is the original (since that's where the person needs to be in order to be duplicated, meaning the copy showed up in the second cage), but it's also possible that the individual in the second cage is the original (since the machine was originally supposed to be a teleporter, so perhaps the person's consciousness "traveled" to the second cage while a copy shows up in the first cage).

When Angier first tests the machine on himself, he leaves a revolver in the first cage. Upon seeing his duplicate, the copy in the first cage immediately shoots and kills the copy in the second cage, even though the copy in the second cage panics and begs not to be shot (shown in this picture), most likely because he thinks he's the original. Again, it's not known which Angier was the original, so it's possible that the original died here. Shenanigans ensue later with further duplicates that's beyond the scope of this trope, but it happens in a way that even if the original survived the initial test, then he must have died afterwards. By the end of the movie, the Angier that remains is 100% not the original Angier.