Born With a Jealous Mind - S1.E22

Upon having his act for the school talent show, a dramatic reading of Coleridge's ""The Rime of the Ancient Mariner,"" shunned, Malcolm decides upon the somewhat thematic revenge of turning all the water in the city into hydrochloric acid. Also, Tanker learns the danger of bingeing on dill pickles, and spends the episode in agony from severe stomach pain, and learns an important lesson about where his limits lie.