In a train there was a Canadian, an American, a spectacular looking blonde and a frightfully awful looking fat lady.
The train happens to pass through a dark tunnel, and the unmistakable sound of a slap is heard.
When they leave the tunnel, the American had a big red slap mark on his cheek.
** The blonde thought - "That American son of a bitch wanted to touch me and by mistake, he must have put his hand on the fat lady, who in turn must have slapped his face"
** The fat lady thought - "That dirty old American must have laid his hands on the blond and she smacked him"
** The American thought - "That damn Canadian put his hand on that blond and by mistake she slapped me"
** The Canadian thought - "I hope there's another tunnel soon so I can smack that stupid American again"