A playground is an area that is designated as a safe place for children to play, and includes play equipment such as swings and slides.
On March 3, 1986 at a playground in Hill Valley, California, Marty McFly told a boy about when he survived being shot by Buford Tannen in 1885 using a makeshift bulletproof vest. At that point, the boy's mother told her son to get away from Marty, calling him a weirdo. The other parents hurried their children away as well. She admonished Marty, stating that he's too old to be telling cowboy stories. Dejected and alone, Marty wondered whether he really was.