See, there were these two guys 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!
So like they get up on to the roof, and there, just across the narrow gap, they see the rooftops of the town, stretching away in moon light all the away to freedom. Now the first guy he jumps right across with no problem. But his friend, his friend daren't make the leap. Y'see he's afraid of falling.