Open Water (2003) - 6/10
A shark is basically a big-ass stomach with rows and rows of teeth attached. They can eat you the fuck up, and they will given half a chance. This is based on the true story of an American couple that got left at the Great Barrier Reef whilst on a diving trip because someone fucked up the headcount. Good one, dick'ead. It does make you wonder, what the sharks-are-biting-my-toes-ing hell would you do in their situation?