She Must Be Single

A woman walks into the store and purchases the following:
1 small box of detergent
1 Bar of soap
3 individual servings of yogurt
2 oranges
1 stick of women's deodorant

She then goes to the check out line.

Cashier: "Oh, you must be single."

Woman: "You can tell that by what I bought?"

Cashier: "No, you're fucking ugly!"