Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Postal service conspiracy!

I've never read Pynchon before, but his style, those winding, iridescent sentences seem like an important reference point for a lot of American authors who come after him, people like Don Delillo, Donald Barthelme, David Foster-Wallace, Johnathan Franzen, Neal Stephenson, William Gibson etc. He's able to synthesize obscurant historical references, pop culture, conspiratorial paranoia and drug use into this funky, swirling melange. It would almost be a kind of metaphysics, if it wasn't so kooky and consistently playful. Reading this, it feels like someone peeling off the surface of postwar American life, showing you this messy, bizarre, occasionally terrifying blend of forces that might have it in for you, or might just be yanking your chain. Or maybe both.