I once had an interview that told me to “design Twitter”. I drew some diagrams on the whiteboard, and the topic of the database came up.
I asked “do we want to have consistency or availability for this?”, to which the interviewer said “I want both”, to which I said “umm, I’m pretty sure you can’t have both, CAP theorem and whatnot”. We spent two minutes arguing which led to me taking out my phone and pulling up the CAP Theorem Wikipedia page, and eventually the interviewer begrudgingly admitted I was right.
I surprisingly did get an offer after that interview but I found it a little annoying to be interviewed by a person with less experience than me who I have to argue with because his understanding of computer science is wrong.
