Lisa becomes in demand as a baby-sitter so,when Marge and Homer,attend the opening of the Squidport quay,they leave her in charge at home. An angry Bart plays her up,resulting in his dislocating an arm and bumping his head and Lisa bundles him off to the hospital with Maggie in tow. They end up at Squidport where Lisa is mortified that people should think her incompetent but,after Bart apologises,she ends up back in business.
—don @ minifie-1