The little boy is sitting on the toilet reading a comic book. But about every 10 seconds or so he puts the book down, grips onto the toilet seat with his left hand and hits himself on top of the head with his right hand.
His mother says, "Billy, are you all right? You've been in here for a while."
Billy says, "I'm fine, mummy... I just haven't done it yet."
Mother says, "OK, you can stay here a few more minutes. But, Billy, why are you hitting yourself on the head?"
Billy says, "It works on the ketchup bottle!"
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