Open Water

Open Water might be a bit too low budget for many audience members.

But this is a prime example of how budget should not hold back a brilliant concept.

This is as realistic as it comes, from the scene in the hotel room where the couple lounge around completely nude (like people do in real life!), to the anxiety and horror of being in the Open Water, alone.

This might very well be an underrated masterpiece that has spawned numerous awful sequels.