@LukeAlmighty
Cats are sensitive to changes. So in the perspective of the cat it fell asleep, then woke up in pain or discomfort.

So either the cat doesn't feel it because of different pain tolerance. Or it's mutilation that can cause psychological problems.

Like I don't know why you would risk giving a cat problems just so it could look cool. It's stupid, and a majority of cat owners like to dump their cats when they do start to have problems.