The PTA Disbands

After a disastrous field trip, Mrs. Krabappel argues with Principal Skinner over providing the school with more money. When Skinner refuses, Mrs. Krabappel calls for a teachers' strike. The kids enjoy their time off (except for Lisa, who goes insane over not being in a classroom setting), but the fun comes to an end when the schoolboard hires people from the neighborhood to be non-union substitutes until the strike ends.