As the man walks into the bar, everyone is staring at him.  He has a disproportionally small head.  No one says anything until an old drunk says, "Hey Pal, you know you've got a really small head?  How come you have such a small head?"

"You see," says the man, "after a shipwreck I was marooned on a deserted island.  There I spent 10 long years alone.  Then one day an old lantern washed ashore.  As I began to wipe it clean a beautiful Genie came out."

"For releasing me from the lamp I will grant you 3 wishes", said the Genie.

"First, I want a boat so I can sail from the island", I said.  *Poof*  A large fully crewed yacht appeared.  "Next I want a million dollars for every year I've spent on this God forsaken island."  *Poof*  The cash appeared.  "And finally", said I, "since I've been here alone for so long I wish to have sex with you."

"Sorry", said the Genie, "that's against Genie rules."  "Oh please", I begged, "it's been sooo long."  "No, I can't have sex with you" insisted the Genie.  "Okay", I said, "then how about just a little head?"