The Lunatics

Two madmen have escaped from their cells, and are stood upon the roof of the lunatic asylum. In the moonlight they can see the entire city stretching out before them. The only thing denying them freedom is a six foot jump to the next building.

The first madman takes a run-up and clears the gap easily and calls to his mate to follow. But the second madman freezes and shouts back 'I can't do it, it's too far.'

'Don't worry,' says the first madman, 'I've an idea.' So he takes a torch out of his pocket, and shines it across the gap. 'Now you can walk across the beam.'

'You must think I'm crazy' replies the second guy, 'you'd turn it off when I was halfway across.'