In reply to Mark Collins:
I don't know if this falls under the definition of ambient but since David Lynch is mentioned on the other thread I'll throw Eraserhead into the mix.
I saw this film WAAAAAAY to early in my life and it burrowed itself in my psyche and has lain there ever since. It's like having a bad dream that leaves you feeling anxious and uneasy even through you can't quite remember it. I still have occasional anxiety dreams about it.
The lady behind the radiator. The baby. The chicken. The embryos dropping onto the stage. The "In heaven, everything in fine" song gives me a feeling of minor dread.
Maybe if I watched it for the first time now, I'd think it was a load of pretentious w*nk. But it was a bit too much for a kid to process and I've never really been able to get it out of my head. I've not watched it for a few years...I might go back and watch it again. I feel the need for a mild panic attack