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Walt Disney Pictures/Entertainment Pictures/ZUMAPRESS.com
Based on the 1972 book of the same name, this is one of the films that made future two-time Oscar winner Jodie Foster into a star at 14 (Taxi Driver, out the same year, had a slightly different audience) and it's the original body-swap movie as far as the slew of imitators in the 1980s were concerned.
Annabel Andrews (Foster) and her mom Ellen (Barbara Harris) magically swap bodies after they simultaneously say—in different locations, unbeknownst to the other—"I wish I could switch places with her for just one day." Unlike in all the other Freaky Friday films that ensue, Annabel's parents are still married in this one, but her oblivious dad Bill (John Astin) never quite catches onto the 24-hour upheaval that took place right under his nose.