Two men, Joe and Mark, are trying to get in a quick eighteen holes, but there two women golfers in front of them who are taking quite a long time to play each hole.
Mark says, "Why don't you go over and ask if we can play through?"
Joe gets about halfway there, turns and comes back.
Mark says, "What's wrong?"
Joe says, "One of them is my wife, and the other is my mistress."
Mark says, "That could be a problem. I'll go over."
He gets about halfway there and he turns and comes back, too.
Joe says, "What's wrong?"
Mark says, "Small world!"
