The story is told of four people who shared a berth in a train going from Paris to Madrid: a beautiful young woman traveling with her grandmother, and a handsome young army lieutenant who was with his commanding officer.
On the way the train passed through a tunnel, and the train became pitch black.
Suddenly, in the darkness there was a sound of a kiss followed by a slap. When the train emerged from the tunnel, the four sat stone faced as if nothing had happened.
The beautiful young woman thought to herself, "That was a wonderful kiss, but my grandmother must have slapped his face and he probably thinks I did it and he won't pay attention to me again."
The grandmother thinks, "That's a fresh thing for that man to kiss my granddaughter. I'm sure glad she stood up for herself, I'm sure it will teach him a lesson."
The commanding officer thought, "This is terrible, she must have thought that I was the one who kissed her, wait until I get back to the base, I'm really going to give my lieutenant a piece of my mind."
And the handsome young lieutenant thought, "This was my day. I got to kiss a beautiful woman and slap my boss and get away with both."