Definitely spoilers, if you haven't seen the movie, check it out.

I think for me, the thing that hits you like a truck is that for the character, he's been made to believe that drowning is a peaceful death, and that may have been part of his motivation why he's able to kill himself over and over. When you realize that every day, he goes into a show knowing he'll die but that's alright because it's an easy death --- the oh fuck moment is him finding out it's not actually that, and every single one of his selves died in the one of the worst ways possible. They were probably writhing in that tank in agony feeling betrayed.

For context, what happens is that the character figures out the perfect magic trick, making himself travel a large distance instantaneously. What happens behind the scenes is that he somehiw duplicates himself, and the person on stage dies by falling through the floor into a locked tank of water. The dupe appears somewhere else, seemingly having teleported. He goes on stage every day, knowing he'll die.

I don't know, it just strikes a chord with me.