... you can learn from:
Deep Red (1975)
Carlo (Gabriele Lavia): Look, maybe you've seen something so important you can't realize it.
Marc (David Hemmings): But... I'm just trying to understand, because... Carlo ... You know, sometimes what you actually see and what you imagine... get mixed up in your memory like a cocktail... from which you can no longer distinguish one flavor from another.
That's about the most succinct description that I've ever read of what watching an Dario Argento film feels like. Drunk and delirious, check and check.