Batman: The Killing Joke

The Joker: You know, it's funny. This reminds me of a joke. See, there were two guys locked in a lunatic asylum and one night... one night, they decided they didn't like that anymore. They decided to escape. So, they made it up to the roof and there, just across this narrow gap, they see rooftops, stretching across town, stretching to freedom. Now, the first guy, he jumps right across, no problem. But his friend, oh, no way, he's afraid of falling. So, the first guy has an idea. He says, "Hey, I got this flashlight with me. I'll shine it across the gap between the buildings and you can walk across the beam and join me." But the second guy says, "What do you think I am, crazy? You'll just turn it off when I'm halfway across!"