See The Clock by Christian Marclay. It is playing in Toronto at the Power Plant September through November 2012.
It is a 24-hour film that runs real time using clips from thousands of films (and some TV). As many have said, it is a hypnotic experience. See it for as long as possible. I planned to attend for a 2-3 hours and stayed for over 14 and really wanted to stay longer…but they closed it at 10pm that night.
More on the film can be seen here.