Trading places was never so funny, and it could only happen on Friday the 13th! That's when the tomboyish and free-spirited Annabel (Jodie Foster) switches bodies with her straitlaced mother, Ellen (Barbara Harris), and suddenly finds herself responsible for running the entire household. In turn, Ellen, now in her daughter's body, faces the daunting challenges of school, including a typing test, field hockey competition, and much more!