From a New York Times article on hands-washing campaigns:

For years, many public health campaigns that aimed at changing habits have been failures. Earlier this decade, two researchers affiliated with Vanderbilt University examined more than 100 studies on the effectiveness of antidrug campaigns and found that, in some cases, viewers’ levels of drug abuse actually increased when commercials were shown, perhaps in part because the ads reminded them about that bag of weed in the sock drawer.

A few years later, another group examined the effectiveness of advertising condom use to prevent AIDS. In some cases, rates of unprotected sex actually went up — which some researchers suspected was because the commercials made people more frisky than cautious.

Bullshit. Show me the study. And show me how it linked condom ads to unprotected sex rates. It's hogwash.