Ugly?

A young woman goes shopping and buys one bar of soap, one yogurt, one microwave dinner for one, one apple, and a romance novel. She goes to the checkout stand, where she notices that the clerk is staring at her. Flattered, she flutters her eyelashes and giggles nervously. He says, "Single, huh?" She replies coyly, "How did you guess?" "Because," he says, "You're ugly."