Great idea!! Should be fun.

A man walks into a bar and orders a shot of whiskey. After drinking the shot he looks into his pocket.
He does this over and over again and then finally leaves.
The next night the man comes back to the bar and again orders a shot of whiskey. Like the night before after each shot he again looks down into his pocket.

Finally, the bartender asks why he looks into his pocket each time after he takes a shot of whiskey.
The man responded, "I have a picture of my wife in there and when she starts to look good then I know it's time to go home."