One was My Wife and one was my Mistress

to walk up and ask if they can play through. About halfway towards them, he stops dead and turns around.
His partner says “why’d you stop?”

“Well when I got close, I realized one was my wife and one was my mistress.”
The other fellow decides to go inquire on behalf of the duo.

He, too, gets halfway, stops, and turns around.
As he comes back to his partner he says “small world…”