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In flashback, the girls find out why Jesse (John Stamos) seems poised to do great bodily harm to Joey (David Coulier). It all began when Jesse brought home his latest girlfriend Corinna (Elizabeth Keifer), ostensibly to give her guitar lessons. Alas, Jesse gets a harsh lesson of his own when Corinna demonstrates a decided preference for Joey--especially when he delivers an extemporaneous one-man reenactment of "The Wizard of Oz". Just when it looks like Jesse and Joey will never be able to mend their differences, an unexpected mediator saves the day.