In high school, there was a minor tradition of trolling the chemistry teacher during his talks about air. One student would say, “If I can’t see it, I don’t believe it.”

Of course the teacher would fall for it hook, line and sinker and the rest of the hour was spent arguing for air while the student would just repeat the same line again and again.

Good for me to remember that trolling and the resulting flame wars were around even before the internet. :-)