A young boy is sitting on the toilet reading a book.
About every 10 seconds or so he puts the book down, grips onto the toilet seat with his left hand, and then hits himself on top of the head with his right hand.
His mother says, “Thomas, are you all right? You’ve been in there for a while.”
Thomas says, “I’m fine, Mommy. I just haven’t gone yet.”
Mother says, “Okay, you can stay in there a few more minutes, but Thomas, why are you hitting yourself on the head?”
Thomas says, “Well it works for ketchup!”
Image used under a Collective Commons License from: https://www.flickr.com/photos/makelessnoise/2261024223