In back to the future Part 2,when Marty walks in the 80's cafe, he gets a Pepsi. There are kids playing a video game in the background. He sees the old Biff. When Marty says "Biff", Biff gets up. After Biff stands up, the camera shows Marty again and the kids in the back are gone.
Maybe those boys were finished playing the game, and left.
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chelsea writes:
maybe they left cuz they were afraid of biff !
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Zombie Killer writes:
In a later scene, you see the boys re-emerge from behind the video game machine, where apparently, they were trying to plug it in so that they could check it out.