Where's Waldo 2.0
Canadian artist Melanie Coles put a 55 ft. Waldo on top of a building somewhere in Vancouver. It's big enough to be visible on Google Earth. You're challenged to find it. Your reward, as with the books, is the inexplicable satisfaction of pointing at Waldo and shouting "There he is!"
Via Computerlove, where you can find the exact location in the comments.