An old cop named Murphy

MURPHY goes into the confessional and says to his priest "I had an affair with a woman. . . almost." The priest says, "What do you mean, almost?" MURPHY says, "Well, we got undressed and rubbed together, but then I stopped" The priest says, "Rubbing together is the same as putting it in. You're not to see that woman again. For your penance, say 5 Hail Mary's and put $50 in the poor box." MURPHY leaves the confessional, says his prayers, then walks over to the poor box. He pauses for a moment and then starts to leave. The priest, who was watching, quickly runs over to him saying, "MURPHY!!! I saw that you didn't put any money in the poor box!" MURPHY replies, "Yeah, but I rubbed the $50 on the box, and according to you, that's the same as putting it in.