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When Cory insists that teaching is easy, in comparison to learning, Mr. Feeny agrees to a bet; Cory and Mr. Feeny temporarily switch roles, with Cory teaching social studies for one week, while Feeny is a student.
Alan's mother (Rue McClanahan) arrives, gives Cory a Cal Ripken rookie card, and promises to get it autographed by "the man in the picture".
Cory's dream to be a big-league baseball star is crushed by Mr. Feeny when the class is assigned to envision its 20th reunion and is given a grade of "Incomplete".