I feel like a lot of the people will misunderstand this movie on the first viewing. The poster would lead you to believe that it's a supernatural werewolf film, when really it's a look into someone's rapid mental deterioration into madness. There are solid performances from the cast, especially Shelly Duval in what would be her last film role. But also a surprisingly nuanced performance from Edward Furlong. The narrative is possibly the biggest dealbreaker for people and it's uneven and confusing, but it's told from an unreliable narrator. Go in it with an open mind and solve the puzzle yourself.
