What a great idea!! And no need to worry about your answers -- they were great. It reminded me of my interview 3 years ago - I too was taken off guard by a totally out of the blue question... something about a hotel and what would you do if a guest said their luggage hadn't arrived yet? I was thrown for a loop, I totally had prepared the "Space Mountain" question... I was so thrown off I gave a horrificly stupid answer, which the interviewer even seemed to call me out on for how stupid it was. I said something like... well, since their luggage is missing, we give them a toothbrush while they are waiting? The interviewer was like... um... how would you feel if you didn't have any of your luggage at all for a week vacation and you were offered a toothbrush? I was like... DOH! UGHHH So Stupid. I thought I blew it forever right then and there, but nonetheless, I was accepted. I'm sure you'll be fine! Good luck - Keep us updated!
