According to a new industry study, The Hangover is the most-watched On Demand movie ever. Of course, On Demand has only been big for a few years, so "ever" in this case means "since the first CGI Alvin & the Chipmunks movie came out." (That cinema classic squeaks on to the list at No. 6.) No. 2 went to Twilight, and No. 3 went to the slightly surprising Gran Torino.