Single

Man walks into a supermarket and buys :

1 bar of soap
1 toothbrush
1 tube toothpaste
1 loaf of bread 1 pint of milk
1 single serving cereal
1 single serving frozen dinner

The girl at the checkout looks at him and says "Single are you?"
The man replies very sarcastically "How did you guess?"
She replies "because you're ugly."