There is a girl at work who would stare at me on and off (longest was about 6 seconds). But the other day I thought she was saying something negative about me. She looked at me and then started muttering to some guy she knew. Of course whenever I believe someone is talking about me I always assume the worst and actually make-up what I think they are saying about me. Anyway, are there any nonverbal clues to pay attention to that would help me figure out if this person thinks of me in a bad light (I mean in an appearance way, as we really haven't talked much).