A filmed stage show by stand-up comedian Myq Kaplan (I know, how dumb is that?) but one part of his routine is worth pulling out and repeating.
He said, if time travel exists in the future, Jews will use it to go back in time and try to kill Hitler. Dozens, hundreds, thousands of Jews will do this.
Which, if you're Hitler, and all your life Jews keep appearing out of nowhere, trying to kill you, then disappearing again.... Well, it kinda makes The Holocaust a little more understandable.
I thought that was f'ing brilliant.