Interesting thing that you wouldn't easily expect:

Kooky science!

This is a bottle of hydrochloric acid. I don't remember the concentration. I've had it in a Lipton's iced tea bottle for several weeks. I never take any notice of it. But today I looked up to the shelf and saw that orange-y stuff on the camp. I examined it and it looks like the gaseous has permeated through the cap and made it rust.

WEIRD!!!