got asked a question in Russian out of nowhere during one interview. mind you, i did not list that as a second language, but had a work experience from Russia on my CV.
i quietly soiled myself, answered appropriately in English, then went on to describe my time there, and how i don't remember much of what i learned there for survival.
i was honestly surprised that i understood the question, and I think he was equally surprised that i answered, even if it was in English. fortunately, we had an overall interesting conversation so it did not give me a bad impression of the place in general. 😉