I second the punch technique. My friend gave me permission to punch him in the face everytime he bit his nails. Doesn't bite his nails around me anymore. He just bites them before he sees me, probably from being nervous I might punch him.
Just kidding. My advice is similar to the ones above.
Good luck.
OH wait! Try looking at yourself in the mirror. They say that'll gross you out like it grosses people out when they see you bite your nails.
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