A brilliant lo-fi thriller that centres entirely around Blake Lively's brilliant performance as Nancy, a surfer marooned by a shark. Plays well to fears of the natural world but also gives a guttural punch as we watch the survival instinct come to life in the fittest of our species. Tense, convincing and smart.

Kevin Smith had a podcast where they made a joke about the idea of kidnapping and turning a human into a walrus. It went viral on the twittersphere. Then it became a movie. This movie. Though the whole thing starts out well, with decent doses of good humour and dramatic tension, it all falls very quickly by the wayside. The result is a ridiculous prosthetic walrus suit that envelops Justin Long. Somewhere inside this mess of a movie there's a punchline, if only Smith could get to it without q find out more...