We had a cat who developed brain problems after a reaction to a flea treatment. It was somewhat seizure-like, but instead of a typical grand mal seizure, he’d fly into an uncontrollable berserk rage out of nowhere, then a minute later be somewhat confused and sluggish but otherwise his normal intelligent, loving self.
I nearly lost an eye to him, got climbed and had punctures and tears from calf to scalp on that side, some of which took months to fully heal, and he sent another adult to the ER with her wrist opened to the bone.
Mind you, this wasn’t normal “angry cat”. I’ve dealt with that before. Even the vet agreed it was some sort of brain problem.
We had to put him to sleep over this...he was only 3 years old which made it all the sadder since he was normally the sweetest cat around but we had an elderly person on blood thinners around and since he would flip out with no provocation...just wasn’t safe. Something totally random would trigger it and he’d be berserk...a cough or sneeze, being bumped into, one of our female cats getting a little upset over getting a claw caught in a blanket.
Sometimes humans have what I think is called temporal lobe seizures, when they manifest bizarre or uncharacteristic behaviors, then get post-seizure sleepy for a while, then go back to normal. It’s sad because they don’t know they’re doing it (amnesia after the event.)