Back to the Future: The Game

*Missable* As soon as you enter the expo, you will see a variety of scientific exhibits spread across the room. On the right side near the entrance is an object called "Theremin Booth". Interacting with this will cause Marty to make some strange dance moves in front of it. Continue interacting with this after each set of moves, and eventually (7 button presses), Marty will begin to moonwalk. Once the dance finishes, this trophy will unlock.

For more information, refer to the trophy walkthrough under "The Future isn't Written ".