A businessman enters a tavern, sits down at the bar, and orders a double martini on the rocks.
After he finishes the drink, he peeks inside his shirt pocket, then orders another double martini.
After he finishes that it, he again peeks inside his shirt pocket and orders another one.
The bartender says: "Look, buddy, I'll bring you martini's all night long - but you got to tell me why you look inside your shirt pocket before you order a refill."
The customer replies: "I'm peeking at a photo of my wife. When she starts to look good, I will know it's time to go home!"