There are two guys out on a golf course, and they 
come upon a pair of women playing too slowly. One 
of the guys walks toward the women to ask if they 
can play through. About halfway there, he turns 
around, goes back and says to his friend, "I can't 
go up there and talk to them - that's my wife and 
mistress."

So his friend replies, "I'll go up and ask them." 
when he's halfway there, he turns around, goes 
back and says to his friend, "Small world."