An old nun, a cute Swedish girl, an American guy, and a Frenchman are all in a train car. The train goes into a dark tunnel and all 4 hear a slap. When they emerge, no one says a word but the Frenchman has a red hand print across his face.

The nun thinks that the Frenchman groped the Swedish girl, so she slapped him.

The Swedish girl thinks that the Frenchman tried groping her, but groped the nun instead, so the nun slapped him.

The Frenchman thinks the American groped the french girl and she mistakenly slapped him instead.

The American is hoping there will be more tunnels so he can slap the Frenchman again