Biting nailsChewing on your toothbrushBanging the handle of the toothbrush on the rim of the sink to get the water out of the bristlesLocking doors behind you without noticingNoticing that your dream earlier wasn't real and was just a dreamNo matter what you add 'just kidding' at the end of every jokeSaying 'hm?' or 'what?' even if you heard the questionRaising your hand in class even if you don't know the answer, and when you notice you don't know you retract it.
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