Despite what genre labelists may say, there are really only two kinds of musical acts: ones that clearly have fun onstage, and ones that might. However, hip-hop trio Das Racist makes other acts in that first category look like stuffed shirts by comparison. Nothing, be it racial relations or the stage setup at Rock and Roll Hotel, was safe from ribbing and lest Future of the Left actually come through town, Das Racist may win this year’s Andy Falkous award for bitingly hysterical stage banter.