What's a phrase you misinterpreted the meaning of for the longest time?

https://discuss.tchncs.de/post/29155606

What's a phrase you misinterpreted the meaning of for the longest time? - tchncs

I’ve seen people using “that’s what she said” in a very serious setting, as a way to say “good point/touché”. They had no idea it was from the Office.

As a non native English speaker it took me some time to fully grasp the meaning of “i couldn’t care less” it’s quite tricky
Don’t worry, plenty of people in the US get it wrong.
“I could care less”