HEC Paris - Sep 2010 intake

so i am having some trouble thinking of a good topic for my interview presentation. at first i was going to do something related to the industry in which i want to work upon completing my MBA studies, but is that too boring? Another factor is that this would require research and I might not be as comfortable speaking about something I just learned about a few days prior.

browsing through these posts, someone said they did their presentation on ethnic food. I could do a presentation on that quite readily, but is that too casual?

or, i do take martial arts, and i could do a presentation on that. one of my career goals is to start my own business in China, so it is sort of related. but is that also too casual and too hokey?

help!