Ugly

Nellie, shopping at her local supermarket, selects a quart of milk, a dozen eggs, a pound of bacon and a quart of orange juice.

A drunk standing behind her, watches as she places the items in front of the cashier.
He says to her, "You must be single."

The woman, startled but intrigued by the derelict's intuition, looked at her four items on the belt. Seeing nothing particularly unusual about her items, she says, "Well, you're correct, but how on earth did you know that?"

The drunk staggers as he puts his beer in front of the same cashier and says, "’cause you're ugly!"