Actual conversation I had with the (still in high school) grocery clerk the other day.
Clerk: You're like the third person I've checked out today who's bought a pork butt. (Giggles)
Me: Well, they're on sale and we can get several meals out of one.
Clerk: I just called my manager and asked him if he'd ever eaten a pig's butt and he said he hadn't.
Me: Actually, this is the shoulder of the pig; they just call it pork butt. Ham is actually a pig's butt.
Clerk (with wide eyes): So when I have a ham sandwich, I'm eating a pig's butt?
I'm guessing she's not in her school's Future Farmers of America club.
That's just a guess, though.