The Museum of Contemporary Art's new show "Art in the Streets" opens next weekend, the first show of its size to look at the history of street art. Most of the big names will be included in the retrospective, but like anything of this kind, a lot of artists will be missing from the show. Graffiti artist KATSU threw his name into the mix the other morning, and while may already be buffed out, it's worth noting and sharing. Who's going to hit it next?