From Almaniac Glenlightened of Melbourne, Transylvania:

Pip Wilson walks into a supermarket and buys the following:

1 bar of soap
1 toothbrush
1 tube of toothpaste
1 loaf of bread
1 pint of milk
1 apple
1 banana
1 orange
1 peach
1 plum
1 tomato
1 lettuce
1 cabbage
1 potato
1 muesli bar
1 pie
1 box of cereal
1 frozen dinner
1 single frozen pizza

The checkout girl looks at him, smiles, and says "single huh?"

Pip smiles sheepishly and replies, "How did you guess?"

She says, "'cause you're so ugly".