I've always thought this type of thing to be true. Anytime you try to force something down people's throats, the reaction is typically the opposite. Such as spending sooooo much time discussing the evils of sex, is going to cause teenagers to want to experiment far more.
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http://www.timesonline.co.uk/article/0,,2-1798944,00.html
(On an infant's shirt): Already smarter than Bush