I still remember one of the most interesting questions I have been asked last year when I was interviewing for a Software Engineering position:
How would you explain to a 12 years old what an API is?
At first, I was surprised: it certainly sounded like an uncommon question for a Software Engineering interview. And yet I tried to answer as best I could, trying to come up with a concise definition that could convey what I meant, but without assuming any specialist knowledge about computers and software.
As I progressed with the interview, it became evident what kind of ability my interviewer was trying to test.