I don’t recall having Fs as a kid. We had Es. If F is for “Failure,” I wonder what E stood for. “Eek!” maybe. No, too icky. How about “Enervated”? Hmmm, too pretentious, me-thinks. “Enfeebled”? Nah, that’s weak. “Errantum!” I like that — but I’ve no idea what it means, though it sounds “smartish.” That’s it, then. They must have dropped E and gone to F because there was no good E word. (I used to tell my parents E stood for “Excellent.” I don‘t’ think they bought it. Too bad.)