Lisa's Rival

S6, E2: A new student joins Lisa's class, and quickly becomes a rival to Lisa, both intellectually and musically. The competition between the two heats up to the point where Lisa enlists Bart to sabotage one of her rival's projects. Meanwhile, Homer takes 100 pounds of sugar from an overturned truck and makes grandiose plans for it until a rainstorm makes the sugar melt away forever.