I got one of the best questions of all time. They asked me how they could tell if someone like me was a genuine good hire or a fake. I couldn't help laughing but it was a brilliant question and quite easy for a genuine person to answer. I said that I go on gut instinct (I knew they liked the cut of my collar by this point, so I was directing them to follow this rather than for some smart response, which I did not have).
I was also asked how I described my (difficult to describe) role at a barbecue. This is a variant of the 'elevator' question although possibly focusing more on the answer than concision. Again, a great question.