An Englishman, a Frenchman and Claudia Schiffer are in a train, sitting together. The train goes through a tunnel, and being one of the old style trains with no carriage lights, they are sitting in complete darkness.
Suddenly there is a kissing sound, followed by a large slap. When the train emerges from the tunnel, the Frenchman has a large slapmark on his left cheek, and the Englishman and Claudia Schiffer are sitting there like nothing has happened.
Claudia Schiffer is thinking "The Frenchman must have tried to kiss me, but kissed the Englishman by mistake and got slapped for it."
The Frenchman is thinking "The Englishman must have kissed Claudia Schiffer, and she tried to slap him but hit me by mistake."
The Englishman is thinking "This is great! Next time we go through a tunnel, I can make another kissing sound and slap that french w**ker again!"