Here's one.
A little boy notice's a man with a abnormally small head.
So the boy walk's up to the man & say's "Mister, why do you have a small head?".
The man reply's, "Well, I was out fishing on the bank, when I thought I'd caught a shark. Because it was so strong, but eventually I pulled it up. Turned out to be a Mermaid, the Mermaid granted me one wish, just one...
So I just asked her...
How about a lil' head?"..

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