Two men are in a lunatic asylum and one night, they decide they don’t like living in an asylum any more. They decide they’re going to escape!
They get up onto the roof, and there, just across this narrow gap, they see the rooftops of the town, stretching away in the moonlight to freedom.
The first man jumps right across with no problem.
But his friend, his friend didn’t dare make the leap, afraid of falling.
So then, the first man has an idea… He says, 'Hey! I have my flashlight with me! I’ll shine it across the gap between the buildings. You can walk along the beam and join me!'
The second man immediately spots the problem with this and shakes his head. '
"What do you think I am? Crazy? You’d turn it off when I was half way across!"