An example of what I mean:
I, in China, told an English speaking Chinese friend I needed to stop off in the bathroom to “take a shit.”
He looked appalled and after I asked why he had that look, he asked what I was going to do with someone’s shit.
I had not laughed so hard in a while, and it totally makes sense.
I explained it was an expression for pooping, and he comes back with, “wouldn’t that be giving a shit?”
I then got to explain that to give a shit means you care and I realized how fucked some of our expressions are.
What misunderstandings made you laugh?
I used to hang about with this Italian couple, and I remember smoking outside a pub with them years ago when I sort of offhandedly said “it’s like the difference between shit and sheet”, and one said “what’s the difference?” so of course I spent a good ten minutes trying to demonstrate the difference by saying “shit” and “sheet” over and over with them trying to copy me. The bouncer loved it.