Never bite your lips in front of other people. In fact, never bite your lips ever.
A lot of you don't know this, but biting the dry parts off your lips, is not gonna help moisten them, it'll only further damage your already-chapped-lips. Even though it feels smooth after you've peeled them off, piece by piece. Plus from afar you look like a lost child. Never bite your lips.
Don't ever shake your legs; standing or sitting. Girls, especially. GIRLS, ESPECIALLY.
Ohh, you know. You see leg-shakers everywhere, the mall, at the restaurants, or.. when someone's about to present a big presentation.
So when you're sitting down, and instantly you shake/bounce your leg up and down, with the ball of the foot on the floor. Imagine a girl doing that. If it were a guy, well, fine, I'd make an exception, but girls. I mean, really? STOP IT. Just, STOP, IT'S annoying.