While not as well known as his superstar brother, comedian Chris Rock, Tony Rock has plenty going for him. In one funny routine, he talks about the "whitest thing he ever saw." He recounts witnessing a citizen's arrest at an airport when a guy leaped into "full white guy mode" after he saw someone take an elevator "without authorization." A great storyteller, Rock performs tonight at 7:30 at the Improv. Tickets are $17, and Rock has shows scheduled at the club through Sunday. (Niesel)