I remember people leaving their houses, and going on like wild goose chases for things. It was insane. And I'll never forget when people got cakes in the mail with cell phones baked in it. "Joker" had us doing the most insane shit.
Oh, the Viral Marketing. This was one of the most awesome things I have lived. I even got a Citizens for Batman key chain! For anyone interested in reviving this, Anita from SuperHeroHype, (and author of the wiki) made a fansite with almost everything from the viral campaign... Joker style!!! http://www.whysoseriousredux.com/