A Secret Identity is one of the most important secrets a costumed superhero can have, and the most carefully guarded. However, no matter how Crazy Prepared a hero thinks he is for any given contingency, eventually someone -- for purposes of this article, let's call him "Tucker" -- will stumble onto his secret. So how can one convince Tucker that he is mistaken, that the superhero and the civilian are not one and the same? How about seeing the hero and the civilian in the same place, at the same time? Of course, if you're an Anti-Hero or a Villain, you could always just kill Tucker.