A young marine and his commanding officer board a train headed through the mountains of Switzerland. They can find no place to sit except for two seats right across the aisle from a young woman and her grandmother.
After a while, it is obvious that the young woman and the young soldier are interested in each other because they are giving each other "looks". Soon the train passes into a tunnel and it is pitch dark. Suddenly, there is a sound of the smack of a kiss followed by the sound of the smack of a slap. When the train emerges from the tunnel, the four sit there without saying a word.
The grandmother is thinking to herself: "It was very brash of that young soldier to kiss my grand daughter, but I'm glad she slapped him."
The commanding officer is sitting there thinking: "I didn't know the young Marine was brave enough to kiss the girl, but I sure wish she hadn't missed him when she slapped and hit me!"
The young women was sitting and thinking: "I'm glad the soldier kissed me, but I wish my grandmother had not slapped him!"
The young Marine sat there with a satisfied smile on his face. He thought to himself: "Life is good. When does a fellow have the chance to kiss a beautiful girl and slap his commanding officer all at the same time!"