I say that bright light makes me sneeze but here is proof that I'm not just making it up.
http://www.sciam.com/article.cfm?id=looking-at-the-sun-can-trigger-a-sneeze Apparently it affects around 1/3 of people and should have the same effect on one of both of my parents.
Also it means that my brain is wired somewhat wrongly, but we all knew that anyway :)