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Underrated:
Pin (1988): I don't think many people have seen this movie, at least I'm sure is not as well known, so I guess it can also serve as a sort of recommendation. It's a movie virtually seamless. Highly enjoyable.
The Dark Hours (2005): Another movie, which despite having won several awards at the time, not as well known by the mass public but it is original, mainly the psychological development of the protagonist, some unexpected turns. Really, really good.