Bad habits

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Everyone has bad habits or little things you do without noticing. In my case, bad habits come out to light when I'm mad or stressed out, I have a tendency to bite my nails and I also put my headphones on and ignore people even if they are just talking  to me.  I know is rude, but sometimes when I'm so stressed or angry I just have to control myself to not explode and  this are a few of the things I do to control it.
My habits are very common and I know there are some weird ones. So.. What are your bad habits?