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In the original "Freaky Friday" movie, what causes the body swap?

Freaky Friday promotional art
Copyright by Walt Disney Pictures and other relevant production studios and distributors. // Moviestillsdb.com
The famous quote might be "Walk a mile in someone else's shoes," but the "Freaky Friday" franchise skips the metaphor and just puts you in their whole body. The book has been adapted into a movie five times, and the reason for the body switch changes every time. The original 1976 movie starred Barbara Harris and a teenage Jodie Foster. What causes the body swap in the original "Freaky Friday"?