学校の先生は生徒との色々と面白い体験をするので、Reader's Digestにその特集があり、これはその一つです。
After a colleague had finished his English lecture and his class had filed out, a student stayed behind do confront him.
"I don't appreciate being singled out," he told his teacher.
The teacher was confused. "What do you mean?"
"I don't know what the 'oxy' part means, but I know what a 'moron' is, and you looked straight at me when you said it."
注: The word oxymoron is itself an oxymoron; in Greek, oxy - means "sharp" or "wise," while moron means "foolish."