Overview
Shrooms is a 2007 psychological horror film written by Pearse Elliot and directed by Paddy Breathnach. The film stars Lindsey Haun, Jack Huston, and Max Kasch. Its plot follows a group of American students and their English guide who are stalked by a serial killer while out in the woods looking for psilocybin mushrooms.
From Wikipedia (CC BY-SA 4.0).