(ABSURDIST COMEDY) Bumbershoot has proved to Seattle's clubs that they need to start booking comedy acts (remember those lines around the Charlotte Martin Theatre?), and thank goodness, because now we are getting to see nationally recognized alternative comedians with some regularity. Michael Ian Black and Michael Showalter are two of the members of the Stella comedy troupe. They are both ridiculously hilarious. (Neumo's, 925 E Pike Street, 709-9467, 8 pm, $20 adv, all ages.)