Oh I know!! But, what about that person whom you have never met, that keeps talking to you when you are trying to be attentive to the teacher. Oooo that just is the rub to end all rubs. Because I have gotten the ugly looks from the teacher for it! Who me?? It wasn't me, I was just sitting here minding my own business.
Or ... How about a student that keeps asking you to school her on something when you are trying to sew. There should be a set of rules on the walls.