Finally, the age-old programming debate visualized in its purest form. On the left, we have a toilet paper roll installed "over" (O), representing those who believe empty values should be represented by a zero. On the right, we have the "under" orientation (NULL), championed by developers who insist NULL is the proper way to represent nothingness. Just like the bathroom debate that's destroyed friendships and marriages, programmers will fight to the death over whether to use 0 or NULL when something doesn't exist. And much like toilet paper orientation, whichever side you choose reveals your true character as a developer. Choose wisely—your code reviews depend on it.