No! Doriiiiii! You're in big trouble now! Okay, so if you didn't get the joke when Doriiiiiiiii tells the principal her score on the math test, or if it just seemed pointless, here is an explanation. The principal is a goldfish, and goldfish have a memory span of three seconds. So if it's the lowest score in three seconds, then three point one seconds ago it might have been F----------------------------------------------------------------------. The world may never know. (More like he will never know because three seconds after this took place, he forgot. Poor fish.)
