Do you have a bad habit, etc.?

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Do you have a really bad habit that annoys yourself or other people, but try as you might, you can't shake it?! For me it is biting my nails, without being nervous, stressed or anything like that! Also, I'm quite fanatical to do things exactly right and will be ever so competitive to do it exactly right! What is the one thing about yourself that annoys either yourself or other people most of the time? Or is there a bad habit that you have been trying to shake since forever?