Here is a real funny episode in which Beavis and Butt-Head are sent to the principal's 4 times for laughing. They are told that they can not laugh for a week or they will expelled and sent to another school for delinquents. Watch what happens when they have to sit through sex ed class without laughing.
http://www.mtv.com/videos/misc/138239/no-laughing.jhtml
