I once applied for a job at a plasma donation center. They keep their sample freezers at -40°. During the interview process the hiring manager was going over basic info for the job and when they went over the freezer they said "And we keep the freezer at -40°C. I don't know what it is in F though." I then explained that they're the same at -40° and that's why their job posting doesn't list the unit. They then acted like I was incredibly stupid and told me that "no, there's a formula to figure it out. I don't remember the formula but theyre definitely not the same" I didn't feel the need to argue the point further so I just dropped it and moved on.

I never got a call back from them. I'm 90% sure that's why I didn't get the job since Before that point they were telling me how they thought I'd be great manager material.

I still get mad every time I think about it. Jokes on them though. I since learned they were a terrible employer. I got a way better job than that place like a week later.