Nil carborundum illegitimus.
I always thought it was "illegitimi"
I don't suppose it really matters as it was only mock latin in the first place.
"Illegitimi non carborundum" was the original gag.
It was the motto of Vinegar Joe Stilwell, US General in charge of the China/Burma theatre in WWII. He was certainly one of the toughest and most difficult of the Allied Generals.
