The Naked Lunch by William S. Burroughs

It's sickeningly beautiful, confusing and linguistically dense. So far (30 pages in) it shows an astonishing lot of situations and behaviours one can analyse. For example the portrayal of the US police state, surveilling everyone and arresting people on arbitrary things, like owning vaseline, which encapsulates the essence of a police so well.

Highly recommended for anyone whose stomach doesn't cramp from the graphic language (my copy has a card that reads "I hereby confirm that i am at least 18 years of age..."). It's a classic for a reason.