Perhaps my favorite of Buñuel's Mexican years. As a child, Archibaldo de la Cruz willed the death of his young, sexy nanny through the device of a magical music box. As an adult, he finds this box at a pawn shop, and it awakens the exciting feelings he had as he stood over the corpse of his nanny checking out her exposed thigh. He decides to become a serial killer, but it never quite works out that way. Every person he sets out to kill ends up being murdered by another's hand. Actually, I shouldn't say "person," as Archibaldo's violent emotions only arise towards women. There is some heavy Catholic symbology to the picture, and the violence towards women obviously arises from the twisted mores of Catholicism. His first intended victim as an adult, for example, is a brazen tramp who openly expresses her wish to seduce him to get back at her husband. Buñuel had perhaps the most impeccable sense for creating finales, and the one here is as odd and remarkable as any other. Watch the two actions Archibaldo performs with his cane. I'm not 100% sure what they signify, but I know that must be of the utmost importance. Ensayo de un crimen should be watched back to back with Buñuel's 1953 film, Él, also about a man being driven insane over his wife because of his strict religious beliefs. 10/10.
