Gah, I flare my nose when i'm concentrating. It's terrible.
Hum, I pace fervently sometimes when thinking.
When i'm talking to somebody new, and for one reason or another I distrust them/am not impressed, I speak using old english,with a cold feeling to it, and with a far broader vocabulary. Usually people take the hint.
I tend to use alternate spellings if I like them more. I.e: Vampyre, Pheonix, Armour
I'll probably think of more and add them later.