He downs it in one gulp, and then takes a photo out of his pocket and stares at it for a minute.
He returns the picture to his pocket and orders another double martini. He downs it as fast as the first one, pulls out the picture again and stares at it some more.
This goes on, round after round, for the next twenty minutes. Finally, the bartender can’t take it any more and he asks the guy, “Hey, buddy. Why do you keep looking at that picture in between each drink?”
“Well,” slurred the guy. “This here is a picture of my wife. When she starts to look good, I know I’ve had enough.”