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.

Growing up I always wrote off “it’s always in the last place you look” as just another random thing adults loved to just say all the time.
This used to piss me off as a child. Parents would say this when I’d ask them where stuff was and I’d retort “not if I never find it!”