For anyone who is confused by the title: this is a variation of the book name "Phenethylamines I Have Known and Loved", published by a scientist couple in 1991.
https://en.m.wikipedia.org/wiki/Fear_and_Loathing_in_Las_Veg...
Edit: actually scratch that, I have no idea (obviously) what the author had in mind, and could be either.
The first, that occurs in a Cadillac convertible bombing toward Las Vegas at 90 mph, has the author seeing big black, bat-like things swooping around the car, and choosing not to mention them to his companion: "He'd see them soon enough, poor bastard."
The second is in the lounge of a hotel on the Strip, when the author suddenly realizes that everyone else in the room is a vicious, bloodthirsty reptile, and the whole floor is a puddle of shed blood.
Edit: I’ll add that “snaps back to reality” happens if you’re lucky and somehow stay in control