Sitting together in a compartment on a train, traveling through the Swiss Alps, are a French guy, an American guy, an old Greek lady and a young blonde Swiss girl. The train goes into a dark tunnel and a few seconds later there is the sound of a loud slap. When the train emerges from the tunnel, the Frenchman has a bright red hand print on his cheek. No one speaks. The old lady thinks: "The Frenchman must have groped the blonde in the dark, and she slapped his cheek." The blonde thinks: "That Frenchman must have tried to grope me in the dark, but missed and fondled the old lady and she slapped his cheek." The Frenchman thinks: "The American must have groped the blonde in the dark. She tried to slap him but missed and got me instead." The American thinks: "I can't wait for another tunnel, so I can smack that Frenchman again."