Matt and I have both been at the top of the leader board a few times. When we were there last May, our friend got into the hot seat. He only got the first couple of prizes (pins, cap, t-shirt), but it was a riot. The host asked him what he did for a living and he replied that he 'worked with animals'. We cracked up, prompting the host to press him further. He artificially inseminates cows! He was a minor celeb for the rest of the day - even during Fantasmic people were coming up to him and shaking his hand!
Another time (January 2004) we got on to a live recording with Meredith Vieira. We were in the front row right behind her, but we never got to see the show itself.