If the banana market is quoting 100 now, and then moves up 2%, down 5%, up 12%, up 4%, and down 15%, where's the quote now?
And the answer was:
It was a late interview: "Sorry, at the present time, the bananna market is closed."
Additional information
This was asked for a position as an options market maker. The interviewer suggested that the interviewee leave straight away; he didn't get through to the next round.