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Principal Skinner (voice of Harry Shearer) ought to be used to misbehavior from Bart Simpson (voice of Nancy Cartwright) by now, but when Bart escapes from the school's basement after being locked-in to avoid any unpleasantness during a visit by Superintendent Chalmers (voice of Hank Azaria) and manages to run over Chalmers with a lawn tractor, Skinner has had enough and expels Bart. Rather than allow him to sit around all day, Marge (voice of Julie Kavner) encourages her son to read Johnny Tremain, which Bart does after learning the title character is deformed in an accident. To the surprise of everyone, Bart turns into a budding history buff. Meanwhile, the curious Springfield custom of Whacking Day, in which the local spend one day each year beating snakes senseless, has drawn the ire of Lisa (voice of Yeardley Smith), who is offended by the purposeless cruelty to animals. In an effort to help save the snakes from a grim fate, Lisa attempts to attract the serpents to the safety of the Simpson home with the help of her funky bass guitar and the voice of visiting soul icon Barry White. Bart, meanwhile, has done some research and reveals the startling truth behind the origins of Whacking Day. "Whacking Day" first aired on April 29, 1993.