Sherlock Holmes and Dr Watson are walking through the park. They pass a bench with three women sitting eating bananas. "After-noon, ladies" says Sherlock.

Dr Watson turns to Sherlock and says, "Do you know those ladies?"

Sherlock smiles back and says, "If you mean do I know the Nun, the Prostitute and the married woman, no I don't."

"That's remarkable, Holmes," says Dr. Watson. "How did you know what they were?"

"Elementary, Watson. The first woman is breaking bits of banana off and eating it, I deduce she is a nun.

The second is ramming the banana into her mouth with both hands, therefore a prostitute.

"And the third? How did you know she was married? By a ring?"

"No, by the way she is holding the banana in one hand and pushing her head towards it with the other."