A businessman entered a tavern, sat down at the bar, and ordered a double
scotch on the rocks. After he finished the drink, he peeked inside his
shirt pocket, then he ordered another double scotch.
After he finished that one, he again peeked inside his shirt pocket and
ordered another double scotch.
Finally, the bartender said, "Look, buddy, I'll bring you drinks all night
long. But you gotta tell me why you look inside your shirt pocket before 
you order another."

The customer replied, "I'm looking at a photo of my wife. When she starts
to look good, then I know it's time to go home."