"The last thing you expect when you go to see a summer blockbuster these days is to be asked to actually think. But that's just what director Christopher Nolan is demanding of audiences with his latest mind-bending tour-de-force, 'Inception,' which blew away the competition on its way to a $60 million haul over the past weekend. Audiences, it seems, actually like to be challenged once in awhile. For most people exiting 'Inception,' though, there's still one lingering question waiting to be answered:
What just happened?"
Excerpt from an article by Scott Harris
http://insidemovies.moviefone.com/2010/07/19/inception-ending-theories/