The friend doesn't like it but being a friend, he agrees. After the service, he starts talking to the pastor, asking him all sorts of stupid questions, just to keep him occupied. Finally, the pastor gets annoyed and asks Mike what he's really up to.
Mike, feeling guilty, finally confesses... "My friend is sleeping with your wife right now, so he asked me to keep you occupied".
The pastor smiles, puts a brotherly hand on Mike's shoulder and says "You'd better hurry home quickly.
Spoiler: