The entire movie industry is all about the cinema. Any film released direct-to-DVD is viewed as not worth your time (a fair estimation most of the time) and the home video market is rarely paid as much attention as the box office. Which is pretty strange given how it's an increasingly important part of how people consume films. The likes of Waterworld, which is still highly regarded as one of the most high-profile flops ever, managed to actually turn a profit once they hit home video (in that film's case VHS), but that's often ignored as a cheeky little nest-egg that studio's don't have to report. In fact, if you want to find actual numbers for a film's post-cinema success you'll have to bring a calculator and some extreme patience; finding actual information about home video sales is nigh on impossible. All coverage is geared towards what's selling well right at this very moment (almost exclusively the latest releases) so getting an idea of the biggest success of all time is hard. And as records for VHS and the early days of DVD are pretty sketchy anyway it makes figuring out how much they helped certain film's overall takings a real pain. Blu-Ray, the youngest of the mainstream forms of physical media, is the only one where actual totals can be accurately calculated. The numbers aren't perfect - they only measure from after the format won the war against HD DVD, so early releases like Casino Royale (once the face of Blu-Ray) aren't counted - but they're the best at seeing what people actually have on their shelves. So today, using the best, publicly available numbers out there, we bring you to twenty best selling (domestically) Blu-Rays of all time. And there's a few surprises.