The air-conditioning in my high school civics class was less than ideal. Everyone who sat in the back would freeze, while everyone in the front would roast.
One day, somebody in the back decided to take a stand. “Mrs Barnes, it’s cold in here,” he said. “We need to turn the air off.”
Since this was a class that was always ready to argue, someone else said, “Turn it off?”
The first student, clearly on his way to a stellar academic career, retorted, “Yeah, off. O-F.”
That’s when one of our other geniuses decided to pipe up: “I would have laughed so hard if you had spelled that wrong.”