Jack goes to his friend Mike and says ...
"I'm sleeping with the minister's wife. Can you keep him back in church for an hour after service for me?"
Mike doesn't like it, but being a friend, he agrees.
After the service, Mike starts talking to the minister, asking him all sorts of stupid questions, just to keep him occupied.
Finally the minister gets annoyed and asks Mike what he's really up to.
Mike, feeling guilty, finally confesses to the minister...
"My friend is sleeping with your wife right now, so he asked me to keep you occupied."
The minister thinks for a minute, smiles, puts a brotherly hand on Mike's shoulder and says...
"You better hurry home now. My wife died a year ago".