I am a horrible nail biter. It is my worst habit, and it makes my hands look less pretty. I used to think that I just bit my nails for boredom and not so much nervousness, but when I get nervous, I bit them to the quick in an insanely short amount of time, so I've come to the conclusion that I always bite my nails but I'm worse when I'm nervous. xD

I also tap my desk quite a bit. I'm fidget like a midget when I'm nervous.