So this barber is cutting hair in his shop one day chatting up his long time friend Bill, when the door pops open and a guy looks in and says "How long before I can get a hair cut?". The barber looks around, looks up at that guy and says "about 2 hours", "Ok!" says the guy and leaves.

Next day, the barber is cutting his friend Bill's hair when the same guy pops his head in and asks "How long before I can get a hair cut?". The barber pauses to look around, and says "about 2 hours", the guy says "Thanks" and leaves.

The next day, the barber is cutting hair chatting with Bill and his other customers, when the same guy pops open the door and says "How long before I can get a hair cut?", completely confused the barber looks around and looks back up at the guy and says "'bout an hour and a half", the guy says "Ok" then quickly rushes off.

The barber looked at his friend Bill with a puzzled look, and said "Bill, could you do a friend a favor and follow that guy. I really want to know what's going on." Bill nodded and got up to leave.

About a half an hour later, Bill pops back in the door just a laughing and a giggling, and the barber says "Well? What is it, is he a spy for another shop? What is it?"

"No no no" Bill says "he's at your house with your wife."