Sergio Aragonés, Gilbert Hernandez, and Scott Shaw provide a trio of troublesome tales. Lisa and Marge go on a mother/daughter retreat and become the life of the party, while Bart and Maggie stay home and play some pranks on Homer. And when Principal Skinner tries to take the horrific fun out of Halloween, Bart treats the beleaguered administrator to a few tricks of his own. Plus, 'Maggie's Crib.'