One day a tired salesman goes into a bar and orders a beer. While he's enjoying his drink, he notices a little old man with a peg-leg and a noggin the size of a baseball. Curious, he asks the man, "how in the world did your noggin get so DAMN tiny?"
The old man replies "I used to be a sailor, but one day I was out sailing when my ship wrecked on a remote island. I lived there for about three years. One day a beautiful mermaid came up on shore. She gave me three wishes. For the first wish, I asked her to be back in civilization, for the second I wished for 25 million dollars. For the third wish I told her that I wanted to have sex with her. She told me "sorry, but mermaids don't have the right equipment to have sex." So I said, "how about a little head then?"