Eraserhead is borderline unwatchable. I love David Lynch, sort of, but without telling people that they're about to sit down and watch an hour-and-a-half of what is effectively an unwatchable piece of avant-garde cinema, then they're not going to be able to appreciate it.
There is nothing worse than getting excited to see a famous director's debut film, thinking you're going to have a good time, and then getting Eraserhead.
There is nothing worse than getting excited to see a famous director's debut film, thinking you're going to have a good time, and then getting Eraserhead.