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October 15 was the 288th day of the year (289th in leap years) in the Gregorian calendar.
- 1931: The Hill Valley Science Expo ends.
- 1959: Biff Tannen's success from the day before is mentioned in the Hill Valley Telegraph.
- Back to the Future: The Game
- Back to the Future: The Game - Episode 2: Get Tannen! (Mentioned only)
- Back to the Future: The Game - Episode 4: Double Visions (Mentioned only)