i always found most of the kids were hypnotized before they came to the class from 16 hours of video games...and if that didn't do it, i would wave large sums of money around and tell them they could have it too...that generally helped...and as a last resort, I would drone on for about 45 minutes until their eyes were glazed over and their brains were like putty in my hand, bending at my every whim in order to finish the torture of this particular class....
and lastly, check out this web site...
http://www.dailylobo.com/media/storage/paper344/news/2006/03/27/News/Hypnosis.In.The.Classroom-1718036.shtml?norewrite200608110332&sourcedomain=www.dailylobo.com