The Killing Joke
Note: We all agree that Batman killed Joker off-screen after the final scene faded to black, right?
There were two guys locked up in an insane asylum together. One night, they decide that they hate it there and they want to escape. So, they make it onto the roof top and, just across a narrow gap, they see rooftops of the town, stretching into moonlight, into freedom.
The first guy jumps across right away without a problem. But the second guy didn't because he was afraid of falling. So the first guy says, "Hey, I have this flashlight with me! I'll shine it between the buildings and you can walk across the beam and join me!"
But then the second guy says, "What? Do you think I'm crazy? You'd just turn the light off when I'm halfway across."