David Lynch's first movie.
If you want to see something really scary, watch this in an old theater late at night with no one but you in the audience. I guarantee you'll never forget the images of the premature baby and the girl in the radiator with the puffy, puffy cheeks. This was obviously the work of a mad scientist genius.
Those who have enjoyed his version of Dune, Wild at Heart, Lost Highway, Blue Velvet, The Elephant Man, and (especially) Twin Peaks, need to rent a copy of Eraserhead and watch it at least twice.