A guy walks up to his friend one Sunday, and says “I’m sleeping with the priest’s wife. Can you hold him in church after mass for me?”.
The friend agrees, and after mass, he starts talking to the priest and asking him all kind of stupid questions, just to keep him occupied. After about an hour, the priest gets pissed and asks the guy what’s up. Having a guilt trip, the guy confesses: “my friend is sleeping with your wife right now”.
The priest then smiles and says “you should run back home, my wife has been dead for years”.