[b-] Bart Simpson is [2] inside the lobby of the [-o] office building where he is doing a weird prank. He lays 白 white 帛 silk 巾 towels onto the lobby floor, slowly covering all of it. Bart hopes that the slick 帛 silk will lead to office workers tripping and falling when they come down the elevator and try to exit the lobby. Sure enough an office worker comes out of the elevator and trips on the 白 white 帛 silk 巾 towel, and Bart laughs at his expense.