Peter showed up at Mass one Sunday and the priest almost fell down when he saw him. He'd never been to church in his life.
After Mass, the priest caught up with him and said, "Peter, I am so glad you decided to come to Mass. What made you come?"
Peter said, "I got to be honest with you Father, a while back, I misplaced me hat and I really, really love that hat.
I know that O'Brien had a hat just like mine and I knew he came to church every Sunday.
I also knew that he had to take off his hat during Mass and I figured he would leave it in the back of church. So, I was going to leave after Communion and steal his hat."
The priest said, "Well, Peter, I notice that you didn't steal O'Brien's hat. What changed your mind?"
Peter replied, "Well, after I heard your sermon on the 10 Commandments, I decided that I didn't need to steal O'Brien's hat after all."
With a tear in his eye the priest gave Peter a big smile and said; "After I talked about 'Thou Shalt Not Steal' you decided you would rather do without your hat than burn in Hell?"
Peter slowly shook his head.
"No, Father, after you talked about 'Thou Shalt Not Commit Adultery' --
I remembered where I left me hat!