Found this online a while back:
There was a Yiddo, a Scum fan and Claudia Schiffer sitting together in a carriage on a train. Suddenly the train went through a tunnel and, as it was an old style train, there were no lights in the carriages and it went completely dark. Then there was this kissing noise and the sound of a really loud slap.
When the train came out of the tunnel, Claudia Schiffer and the Yiddo were sitting as if nothing had happened and the Scum fan had his hand against his face as if he had been hit hard.
The Scum fan was thinking: 'That Yiddo must have kissed Claudia Schiffer who went to slap him, missed him and slapped me instead.'
Claudia Schiffer was thinking: 'That Scum fan must have tried to kiss me and actually kissed the Yiddo and got slapped for it.'
And the Yiddo was thinking: 'This is great. The next time the train goes through a tunnel I'll make another kissing noise and hit that Scum bastard again, harder.'