Three wishes (another)

An old man with a cue ball sized head is sitting at the bar.

“Excuse me,” says the guy next to him. “I don't mean to be rude, but I noticed you have an extremely small head. Is that a birth defect?”

The old man says, “No my ship was torpedoed by the Germans in World War II. I was the only survivor, so I swam to a deserted island. Then one day a mermaid appeared and said she'd grant me three wishes. For my first wish, I wanted to be rescued. She sent for help.For my second wish, I asked for all the money I would ever need. Wish granted. My third wish was to have sex with the mermaid…”

“What'd she say?” the guy asks.

“She said, ‘I'm sorry, mermaids don't have sex.'”

“So,” The old man continues, “I said, ‘Then how about a little head?'”