A woman, a manager and his assistant are sitting together in a train. Suddenly, the train goes through a tunnel, and as luck would have it, the lights go out and it's completely dark.

Then there's this kissing noise and the sound of a loud slap. When the train comes out of the tunnel, the woman and the assistant are sitting as if nothing has happened and the manager has his hand against his face, which is red from an apparent slap.

The manager is thinking, "My assistant must have kissed the woman and she missed him and slapped me instead."

The woman is thinking, "The manager must have tried to kiss me and actually kissed his assistant and got slapped for it."

And the assistant is thinking, "This is great. The next time the train goes through a tunnel, I'll make another kissing noise and slap my boss again!"