Filmmaker Panos Cosmatos’ “Mandy” is batshit crazy — and that is meant as the high compliment possible. This 120-minute hallucination into dreamy hell is visually stunning, and unlike anything, you’ve ever seen before. Yes, there are midnight movie tropes in the film; a chainsaw battle, an atmospheric soundtrack, and Nicolas Cage going completely bonkers by chugging a bottle of whiskey and snorting “cult coke,” but this revenge story, concocted from the deepest parts of Cosmatos’ subconscious, is a unique brand of trippy surrealism.