A Yankee fan, a Mets fan, a beautiful girl and an old woman are sitting in a train. The train suddenly goes through a tunnel and it gets completely dark.
Suddenly there is a kissing sound and then a loud noise that sounds like a slap. The train comes out of the tunnel. The old woman, beautiful girl and the Yankee fan are sitting there looking perplexed.
The Mets fan is bent over holding his face which is red from an apparent slap.

The old woman is thinking : "That Mets fan must have tried to kiss that girl and got slapped. "

The Mets fan is thinking : "Damn it, that Yankee fan must have tried to kiss the girl, she thought it was me and slapped me instead."

The beautiful girl is thinking : "That Mets fan must have moved to kiss me,but kissed the old lady instead and got slapped."

The Yankee fan is thinking: "If this train goes through another tunnel, I could make another kissing sound and slap that Mets fan again.