I have a student who seems incapable of being quiet! I'm trying to get my 6th period to be COMPLETELY QUIET for a certain legnth of time in order to prove a point about behavior. However, one certain student CAN'T STOP TALKING and he sets off all the others. I've called parents, sent him to the office, EVERYTHING. He just keeps talking. Sometimes he acts like he can't control it. He'll even start talking to himself. I wonder if he doesn't have some undiagnosed problem. Any suggestions?