Exams - Chewing

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Ok why is it that when were giving papers we start to chew/bite our pens or pencils? i can never find the theory to it, whenever i am sitting in an examination hall and the paper is given, and i am thinking for an answer i start to chew the end of my pen. lol there are now teeth marks all over it now. Yet i m confused as to why we bite the end. Plz tell me and get me out of this mystery