My girlfriend and I met another couple to go canoeing one day on town lake. The guy in the other boat was a chemist. He trotted out the old "glass is a liquid" thing, and I explained no, that's not true, and I went into great detail. But he stuck to his guns and insisted, and then played the "professional chemist" card, saying "I think I know a little bit more about chemistry than a guy who makes webpages."

I was furious, but my dogged insistence that I was right was starting to draw glares from both of the women, so reluctantly, in the name of peace, I dropped it. Then the ass had the gall to say "Haha, don't worry, I'm sure there's a lot of things about webpages that you could correct me on!"

The worst part is, if I sent him this article, and any number of others proving the same point, he'd just say "what? why are we talking about glass?" That conversation was nothing to him, and I'm sure he's already forgotten it.