I had a cat that was about 3 years old that I had from a young kitten. She was a great cat those 3 years, then she had a litter of kittens and her behavior went odd. When the kittens were about 4-5 weeks old I woke up to kittens literally screaming, and mean yowling sounds. I FLEW downstairs thinking somehow a stray tom had gotten in and was attacking the kittens and it was their own mother attacking them! I quickly scooped the kittens off the floor and got them on the couch and mom was still trying to get at them but I finally got her shooed away and the kittens settled. I chalked it up to be her annoyance with them trying to nurse constantly. Then a few months later I was on the phone and noticed her all hunched in the coner growling like she was being attacked and she started to run at my one year old daughter. I grabbed my daughter and put my other arm out to stop the cat from attacking her and she TORE into my arm and hand and wouldn't let go. By the time I got my arm back I was running with my daughter, crying hysterically, across the room and the cat was chasing me trying to attack my legs while I was throwing stuff at her to keep her from attacking us. She acted like we were attacking her and she was fighting for her life, like she didn't know us. It was a real life scene from "Pet Cemetery". I finally got ahold of her scruff and threw her outside, and then boom, like a switch she was sweet little kitty cat again. I finally let her back in but for a few weeks kept her in her litter box room in fear I'd wake up to a meelee attack on my face or something, but she seemed fine those weeks and I let her back into the rest of the house. Fast forward another month. I had a few friends over one night, one was sitting in my recliner and the cat jumped up on the back of the chair and everything was normal, then all of a sudden I noticed the cats eyes were going bonkers, big pupils then little repeatedly, and her tail and spine would puff up and go down in time with her pupils dialating and i had a feeling an attack was coming on so I opened the door to let her outside and she ran out the door and before I had a chance to shut it she ran back in and attacked my leg. After that I had her put down and sent to the U to be checked for rabies which came back negative. I have had lots and lots of cats in my life and have never seen anything like it, and I have asked several vets about it and they don't really seem to know. I know this turned into more of a story than a question but I really would like to know what was wrong with my poor kitty!