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A young Swedish woman, old Dutch woman, an Englishman, and an Irishman are riding a train...

The train goes through a tunnel and it becomes pitch black in the car, a loud SMACK is heard... the train emerges from the tunnel and the Englishman is rubbing his cheek.

The Swedish girl thinks "I bet he tried to grope me and accidentally got the old woman and she slapped him..."

The Dutch woman thinks "He must have groped the Swedish girl and she slapped him..."

The Englishman thinks "The Irishman must have groped the Swedish girl and she accidentally slapped me..."

And the Irishman thinks "I can't wait for another tunnel so I can smack that English guy again."

Also, a Pole and an American are somehow involved.