All students love a visit from Cool Carl and Mr. Duy.  They have to chuckle when Cool Carl makes a mistake.  Just the other day when Mr. Duy was talking, Cool Carl interrupted him by telling him that he has something important to say.  That's not Cool Carl, and the kids told him so.  It's just not right to interrupt.  If you have something important to say it can always wait until the person is done talking.  Come on Carl, use your head!