From Cell to Organism, lesson number three: the lecturer, whose name I can't remember, demonstrates the specificity of proteins' tertiary structure by explaining aspirin's mechanism of action.

Lecturer: Arthritis has afflicted people from time immemorial. It's an inflammation that doesn't stem from infection, and it basically affects only old people.
Me: HAHAHAHA NO! Except not out loud, you know.

Then I was like nodding along about the aspirin, and the COX-2 inhibitors, because COX-2 is a bad, bad thing.