A woman was shopping at her local supermarket. As she was unloading her items on the conveyor belt, a drunk standing behind her watched as she placed her items in front of the cashier. While the cashier was ringing up her purchases, the drunk calmly stated, "You must be single."
The woman was a bit startled by this proclamation, and at the same time intrigued since she was indeed single. She looked at her items on the conveyor belt and saw nothing particularly unusual about her selections that could have tipped off the drunk to her marital status. Curiosity getting the better of her, she said: "Well, you're absolutely right. I am single. But how on earth did you know that?"

The drunk looked at her and replied, after a short pause, "Because you're ugly."