To me, the movie that best answers your question..

would be The Shallows.. Actually fairly well made - a couple of goofy moments, but good overall.. until the final confrontation.. That ending had to be THE stupidest ending to a movie EVER.. Luckily Blake Lively can see underwater better than a shark when its somewhat dark at night (without a mask) and can totally purposely miss the wreckage below that the poor, stupid, blind, no senses, no ampullae of lorenzini shark can't see or detect..

Stupid.... stupid.... stupid....

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Friendship is like peeing your pants.. Everybody can see it, but only you can feel the warmth..