Four people are in a train compartment: a young woman and her mother, and a young soldier with his boss, Colonel.

The train enters a dark tunnel and the compartment goes completely black. Everyone hears the sound of a kiss, immediately followed by a loud slap. When the train comes out of the tunnel, the boss is rubbing his cheek, and all four quietly sit there, each thinking something different.

• The Colonel thinks: “That young soldier must have kissed the girl, and she slapped me by mistake.”
• The mother thinks: “That older man kissed my daughter, but I’m glad she slapped him.”
• The young woman thinks: “That older man kissed my mother, but I’m glad she slapped him.”
• The young man thinks: “This was perfect. I kissed the back of my own hand in the dark and got to slap the Colonel.”