In 8-1/2 years of life with Bunya (and bunnies), I have never heard him sneeze. At first, I thought he might be choking, but he was very casual about it, seeming maybe a little annoyed and not stressed at all. (But just in case, read about the Bunny Heimlich here).
Since he has been under the weather with a hairball blockage, anything out of the ordinary shaves years off my life expectancy. So here's about 35 seconds of a bunny sneezing. Yes, we will watch for repeat episodes to see if there is something else to worry about (and help the vet pay off any college loans). *sigh*