Shrooms

Shrooms (2007) is a horror, mystery directed by Paddy Breathnach rated 4.9/10.

A group of American teens comes to Ireland to visit a friend who takes them on a camping trip in search of the local, fabled magic mushrooms. When the psychedelics start taking hold, the panicked friends are attacked by ghostly creatures; but how can they determine whether what they are experiencing is reality or hallucination?