It's a little known fact that Pythagorus was a dung shoveller.
While shovelling dung one day, a sudden thought struck him.
He ran to the guy who made him shovel dung all day and proclaimed, "I just realised something, if you add the squares of the lengths of the two shorter sides of a triangle, it will always be equal to the square of the length of the longer side!"
The guy thought for a minute, then replied, "Does that help you shovel dung?"
"Well shut up then."