What do you usually do when...

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When I still had my academic subjects and I had this professor who wasn't a siren but most of the time made us drowsy, I usually went to a vacant classroom -sometimes with my friends - and sleep there for a couple of minutes or so, then I preceeded to the comfort room to wash my face -just to wake me up. How about you? Have you experienced this kind of boring class? If so, what did you usually do to kill some time? If not, what would you do if you were faced with such environment?