Snowboarding champion Tara Dakides — who was injured while performing an outdoor stunt on Late Show with Dave Letterman last February — stops by Monday's Late Show to attempt a backflip from a ramp constructed outside the Ed Sullivan Theater. As a result, New Yorkers are being urged to stay the hell away from Broadway between 53rd and 54th Streets between the hours of 3 and 8 pm. You know, just in case.