What! chewing someone's pen is just horrible get this clear

Of course that pen you borrowed had already been exposed to someone else’s spit when that person was either very much idle or was seriously thinking about something.  I’m against the act of chewing pens but it is much better than opening your mouth open when wondering or thinking very hard because you might have even forgotten to brush your teeth.

People who think hard open their mouths, hit their heads on the wall or chew pens. People who think smart, we are not bothered about you.