Eraserhead is awesome, but, iirc,Lynch has said that he never meant for anyone to have to sit through the whole thing. I can't find the exact quote using the googler, but it was something along the lines of the film being an experiment where one could come in at any point of the film and/or leave at any point of the film and get the same thing out of the film that sitting through the whole thing would provide. Or something.

I'm going back to a film class I took in 1985 so pardon the lack of clarity.

When I was younger (and when it was new), I had a very hard time sitting through it. It was like a nightmare - a very boring, tedious, yet horrifying one. It was so anti- anything I thought a movie was supposed to be.

It's still not one of my favorites, but I appreciate it more now. I get it. As Ebert says, "A movie isn't about what it's about. It's about how it is about it."

I think it's about madness.

I think it is best to watch it multiple times and then watch it some more before you turn 18.

You will turn out to be a much better person for the experience - regardless of how you feel about said experience.

I think it's about parental anxiety.

As time passes, and Lynch degenerates into a purveyor of bullshit puzzle flicks like MULHOLLAND DR. and INLAND EMPIRE, I'm finding ERASERHEAD to be his one really essential movie, the one that never gets stale.

My interpretation is pretty basic, that Henry overcomes the lusts/distractions of the flesh/world and goes to heaven, where everything will be fine.