When I was child I had a grandmother who's cat you couldn't touch because it would flip out and slice the shit out of you without warning. I guess it got really badly injured at some point and it never let anyone touch it after.

Whenever we stayed there this old mean cat that nobody ever went near would jump up and lay on my legs at night. Everytime I always woke up the next morning in the same exact position i happened to be in when it layed down. Ive never been so completely and utterly still as those nights.

I was legit scared to death of the thing.

A friend of mine has an outdoor cat. He didn't adopt it or anything, it just started living in his garden. The cat is quite small, smaller than it should be, but it's quite cuddly. However, the second you stop scratching her ears or cuddling her, she turns into a demon bitch from hell. She will hiss at you and even attack you, just because you stopped petting her. My friend is genuinely terrified of that cat.