A businessman walks into a tavern, sits at the bar, and orders a double martini on the rocks. After finishing his drink, he peeks into his shirt pocket and orders the bartender for another double martini. He repeats this action after finishing the second drink.
The bartender finally says, "Look, buddy, I'll serve you martinis all night, but you have to tell me why you look into your pocket before ordering a refill."
The customer replies, "I'm looking at a photo of my wife. When she starts to look good, I know it's time to go home."