Like most sensible people, I had completely written off M. Night Shyamalan. After all, the guy made Lady in the Water, The Happening, The Last Airbender and After Earth back-to-back - and those are four stone-cold cinematic stinkers. It got to the point where he'd announce a new project and my instinctive reaction would be "who the hell is giving this guy money?". So it took me a lot of convincing to watch 2016's Split.