El caballo del diablo (1975)

Evil is so hard to eradicate from this world because nastiness seems to be nowhere and everywhere at once. How can malice be stamped out when none of us, not even science or religion, can say for sure where bad intentions come from? In El Caballo del diablo (1974), a Mexican exploration of the supernatural forces that determine man's basest behavior, an otherworldly being first inhabits the body of a horse, then takes over the life of a man and leaves the mere mortal on his own to cope with all the havoc thus diabolically wreaked before taking refuge in the horse again. Be forever vigilant: The devil is at home everywhere except in heaven.