Small World

Alex and Jim are trying to get in a quick eighteen holes, but there are two terrible lady golfers in front of them hitting the ball everywhere but where it's supposed to go.
Alex comments to Jim, 'Why don't you go over and ask if we can play through?'
Jim gets about halfway there, turns and comes back so Alex asks, 'What's wrong?'
Jim replies, 'One of them is my wife, and the other is my mistress.'
Alex responds, 'That could be a problem. I'll go over and have a word.'
He gets about halfway there and he turns and comes back, too.
So Jim says, 'What's wrong?'
Alex murmurs, 'Small world.'