There're four people in a train car: An army general, a younger private serving as his escort, an elderly, wealthy woman, and the woman's daughter. The car goes into a tunnel, and everything goes black. A kiss is heard, followed by a slap. The elderly woman thinks, "That young man must have kissed my daughter, and she rightly slapped him." Her daughter thinks, "That young man must have tried to kiss me, but kissed my mother by mistake, and she slapped him." The general thinks, "That young man must have stolen a kiss from that young woman, and she slapped me by mistake." The private thinks, "I'm pretty smart. I kiss the back of my hand and I get to slap the general."
