During a grade school assembly, I was demonstrating the sounds of different organ pipes. I added an extension to one pipe, then asked a question about how the sound would be different; the correct answer being, "It would be lower." I called on a child and she answered, "higher."
I said, "That's a good guess; you were very close: it's actually… lower."
Some of the teachers thought this was funny, but a very annoyed 3rd grader, goaded beyond civility, piped up, "She wasn't close! She was wrong!"
I admired his sense of justice, but he should have raised his hand.