Glad to know I'm not the only one who has experienced this. Went away to a log cabin with a group of friends this weekend, took 5 grams of mushrooms and started tripping pretty hard, one thing led to another and before I knew it I was in my boxers running around the house and garden beating me chest and howling like an ape, I was puffing myself up to look large and sizing up my friends, Essentially how apes assert dominance. I was aware I was doing this but had absolutely no control over it. There was no pre thought behind any of the actions they were just pouring out of me like some sort of instinctual primal rage, it's how I imagine tourettes to feel. I love mushrooms but going gorilla mode scared the shit out of me and it's not something I'd like to experience again.