Willard (1971)

A little flick that blends elements of psycho-drama and animals-run-amuck, along with a hint of old-dark-house. Willard is a socially-maladjusted young man who lives in a gloomy, Victorian house with his co-dependant mother. Their relationship constitutes the weird part of the movie, nudge, nudge. Willard is tolerantly allowed employment at his late father's business, presided over by passive-agressive Ernest Borgnine. With no social life and no friends, Willard resorts to training rats with above-average intelligence. Of course, things take a dark turn when Willard's mother dies and Borgnine's bully tendencies come to the fore, prompting the put-upon Willard to use his rodent buddies to even the score. Also on hand is Sondra Locke as caring co-worker who tries to enter into Willard's world and may be his means of salvation. You find yourself rooting for her to win out. Spawned a more (in)famous sequel, BEN, remembered primarily for it's theme song, which provided Michael Jackson with one of his first solo hits. Very appropriate, in hindsight.