My cat, every once in a while, will get really vicious for no reason what so ever. Lunging at my leg or greg's feel, biting an clawing. I don't understand this behavoir and wonder if it's like when people get irrationally depressed or angry. That the same things that go wrong in human brains go wrong in feline brains and he just gets completely angry at the world and lashes out with out provocation. Is it him feeling powerless, or that too much anthropomorphizing?
Catnip, or the smell of chlorine or bromine will induce this state in him instantly, but sometimes it happens naturnally.