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"Testing students at a University, psychologists made many of them click on a dialog box that in effect said: 'You are about to install some malware. Malware is bad. By clicking yes you are failing the Windows Darwin Test.' Nearly half of them said all they cared about was getting rid of these dialogs."
For more info see http://arstechnica.com/news.ars/post/20080923-study-confirms-users-are-idiots.html