“Some folks in our class used to throw wet paper that they chewed on against the ceiling quite often. It’d stick on there, and it looked disgusting. The clown wanted to one-up those folks, and he chewed a giant ball of paper and threw it at the blackboard. The teacher wrote around it and acted as if nothing happened, then shouted at him after class was over.”

Source: https://www.buzzfeed.com/larryfitzmaurice/reddit-shares-class-clown-stories