the man and the mermaid

a boy was walking down the road when he noticed an old geezer with an unusually small head. the curious boy walked up to the geezer and said, "hey mister! why the heck is your head so small?"the old man looked the boy and replied, "boy, if i wasnt so damn old, id give you a beating... but since you remind me of myself at your age, i will tell you." The boy listens curiously as the geezer explained, "One day i was fishing on the pier when i got a huge bite.. and i said to myself 'holy shit! ive caught a whale!'" "No kidding?" pried the boy. the geezer continued, "but, when i reeled it up, to my surprise, it was a gorgeous mermaid! well, she looked at me in tremendous fright and said she'd give me one wish if i let her free..." "and?" interjected the boy. "well, after some quick thought, i looked at her and said, 'how bout a little head?"