There is a well reported incident within the IT Security instruction community where someone's cell phone went off in class. The instructor walked up to him and held out his hand. The offender (a CIO) sheepishly handed him the phone. The instructor then walked up to the front of the class and dropped the phone in the pitcher of ice water on the front table.

The class then began discussing business ethics, the risks inherent with trusting those in authority and the importance of maintaining control and backups of mobile devices. :)