Biting my nails. I'm not one of those people who like chews off the entire nail or anything like that, but its a nervous/bored habit. Sometimes I don't even realize I'm doing it until Aaron tells me to quit. Also hang nails or a ripped nail if clippers are not readily available (and most times they aren't) I will continue biting until its gone. I try not to but I just fixate on it until I can't stand it any longer.
I've always wanted long beautiful nails Like this:
But unfortunately they snag on something and then I start biting. Ick.
By the way, just so you know, if you google long fingernails, some pretty nasty picture come up. I guess by biting my nails I'm insuring to never look like any of those! :)