Gawd, I'm feeling ill today, so it's a cut-and-paste job courtesy of the most excellent JJ:
A guy with an orange for a head goes in to see a doctor.
The doctor says, "How did you get an orange for a head?"
The guy says, "Well, one day I was walking down the beach when I tripped over an old lantern. A genie came out and said, 'I'll grant you three wishes, whatever you desire...what is your first wish?' I said, 'I'd like all the money I could ever spend.' The genie went 'Poof!', and there it was, all the money I could ever spend.
"Then he said, 'What is your second wish?' I said, 'I'd like a beautiful woman to love me, someone I could enjoy this money with.' The genie went 'Poof!', and there she was, a gorgeous girl who immediately loved me.
"Then the genie said, 'And what is your third wish?'...I said, 'I'd like an orange for a head.'"