I thought I had something concrete to add to this.
I'm beginning to be massively afraid of my cat. She's tiny, but VICIOUS. I was on the receiving end of one of her outright FERAL attacks when I went to shut the back door (there being a cat outside). For the next hour or two, any time I would LOOK at her, she would haul out and attack me. I had hoped that getting her fixed and dewormed would have helped, but it's almost like she's WORSE now.
I mean, granted when she attacks my brother, his instinctual thing is to retaliate, which probably doesn't help things. (I freeze or back off and let her leave.)
I think the second most creepy thing I saw EVER in my entire lifetime was last night as Bacci was howling at me and crawling over the laundry basket from under the dining room table - from the dark came this howling, angry thing with glowing eyes, moving ever so slowly with intent on my doom.
The first, you ask? The day I hit the biker and saw a human splayed across my windsheild, arms akimbo, with the look of "OH MY CRAP" on their face, as we screamed in fear at each other through the glass. It was a total Griswold moment.