An American, a Canadian, a beautiful young blonde woman and a little old lady are travelling on a train together.
At one point, the train passes through a tunnel and the compartment is temporarily plunged into total darkness.
In the darkness, a loud sharp smack is heard. When the train comes out the other side of the tunnel, the American is holding his hand to the side of his face.
The four passengers sit and look at each other. The old lady thinks, “That American must have made a play for that beautiful young blonde woman, and she let him have it.”
The young blonde woman thinks, “That American must have made a play for me and he grabbed the little old lady by mistake, and she let him have it.”
The American thinks, “That Canadian must have made a play for the blonde woman, and she slapped me by mistake.”
And the Canadian thinks, “Boy, I sure hope we go through another tunnel so I can have another crack at that guy.”