Lol...I was thinking about starting a thread on this very topic!
I have a few mannerisms that annoy the heck out of me...
1. If wearing girl-pants, I sashay (my work wardrobe is a gendermix...when wearing guy pants I walk 'normally,' but girl pants make me feel like I need to move differently. Grr! Laundry days suck!)
2. Armadillo syndrome. When nervous I hunch over and sometimes pull my arms into my chest, like a rabbit. ^_^;
3. I used to do cat-stance, but I kinda screwed up my hip doing Aikido and now it hurts to stand for long with weight to one side like that. Mixed blessing I suppose.
4. I smile WAY too much...mostly from nervousness and lack of knowing how to act.
5. A category all it's own...Voice. When I'm nervous, my voice gets higher pitched. When I'm happy, it goes higher pitched. I laugh when nervous, and not the evil-overlord laugh I've practiced to perfection either! Gah! If I had the money I'd hire a voice coach!