"Good news, Turner! You've taken F to a new level! I'm going to give you a super F!"
Student: I don't think I deserved a zero on this test.
Teacher: Neither do I. But it's the lowest grade I could give you.
— A popular Urban Legend.
"You're what? You're giving me a Z? A Z is not a grade, a Z is sarcasm! "
— Lucy, Peanuts