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."