Early issues of Mad Magazine frequently used the word "Potrzebie" as a humorous non-sequiter. It's almost impossible to explain why this was funny to the uninitiated - but I was surprised to find a Wikipedia article attempting to do so.
I was also surprised to learn that the otherwise legitimate Google Calculator converts Potrzebies into millimeters based on a throwaway joke from Mad #33 (see original parody at top of post).
