NOFX: The Hepatitis Bathtub. Wildest because it’s an autobiography, and they spill it all.
Edit: find the audiobook if you can

A long way gone by Ishmael Beah was pretty dark. Story of a boy soldier from Sierra Leone explaining how you get forced into it and the terrible things they did.

The Metamorphosis of a Prime Intellect.

Wild Animus

It’s about a Berkeley graduate who takes a bunch of acid and then dresses up like a mountain Ram in Alaska and becomes increasingly more deranged.

It was on a reading list for a college class. Pirate the book if you decide to read, because the author is a raging asshole.

Diaspora by Greg Egan, it’s one of the best thought out take on what a post human society could look like. Lots of amazing ideas in the book.

Depends in what way you mean ‘wild.’ Crazy even psychedelic, but nonetheless benign? Or are we including disturbing?

Fear and Loathing in Las Vegas is an obvious but nonetheless relevant answer. What a ride.

Also Infinite Jest.

Sadly, Porn

I don’t know how to describe it, expect to be confused and offended and gaslit.

Fanged Noumena by Nick Land

Cyclonopedia by Reza Negarestani

Both are a naked lunch level mindfuck. Don’t treat it as a book, but rather as a stream of consciousness on the acid trip. Don’t try to make any sense, just ride the wave.

Infinite Jest - just the part about video conferencing is wild and is even mire wild when you realize it was written in the 90’s before video conferencing really existed:

“Good old traditional audio-only phone conversations allowed you to presume that the person on the other end was paying complete attention to you while also permitting you not to have to pay anything even close to complete attention to her. A traditional aural-only conversation […] let you enter a kind of highway-hypnotic semi-attentive fugue: while conversing, you could look around the room, doodle, fine-groom, peel tiny bits of dead skin away from your cuticles, compose phone-pad haiku, stir things on the stove; you could even carry on a whole separate additional sign-language-and-exaggerated-facial-expression type of conversation with people right there in the room with you, all while seeming to be right there attending closely to the voice on the phone. And yet — and this was the retrospectively marvelous part — even as you were dividing your attention between the phone call and all sorts of other idle little fuguelike activities, you were somehow never haunted by the suspicion that the person on the other end’s attention might be similarly divided.”

Der Prozess (1915) by Franz Kafka, it still is relevant today.

I went into Do Androids Dream of Electric Sheep? blind. Hadn’t seen the movie, hadn’t read any other Dick, hadn’t even had it hyped to me by a friend. What a series of mindfucks.

Probably some short story I read in high school but from what I can remember the first one that came to mind is Blood Meridian

Definitely House of Leaves. A story inside of a story, inside of a story, with all narrators being just a bit crazy. Text of different fonts, going all over the place and even upside down based on the story. Just make sure to get the physical copy.

Clockwork Orange