There are as many reasons that cats vomit as there are with humans, and I do believe those include "being an asshole" and "fuck your clean _______, that's why."

Mine desires to inhale all food in the universe simultaneously, and this often causes a backlash.

They puke for the same reason they occasionally shit in the middle of the floor. Because you changed the position of the couch a few inches or otherwise modified their environment in some subtle way.

It's normal for them. In the wild they eat whole animals with small bones, like birds and mice, and also eat grass to form a wad to puke back up like owl pellets. Housecats also spend too much time grooming, and get hairballs which also need puked.

They just have weak stomachs, and also puke from eating too fast, or for no apparent reason. They're little barfing machines, that's why they're such picky eaters. It plays hell with their sense of cat dignity, they either flee the scene or play it cool and pretend they didn't just puke.

Completely the opposite of dogs, who happily eat whatever has been rejected, ejected, or digested by a cat, to the dismay of whomever owns both kinds of animal. Dogs are capable of dining upon any link of the food chain.

It's good to know that if I die, someone will make the comments I was going to in my place.