Idaho is a state in the United States.
On May 16, 1946, at Hill Valley Elementary School, after Lorraine Baines told Miss Hodges that Biff Tannen was bullying George McFly, she threatened to send Biff to military school in Idaho. However, Stanford S. Strickland, then an inexperienced teacher, defended Biff, stating he needed understanding and tolerance, since he lived alone with his grandmother. Biff remained a bully, and over time Mr. Strickland became a strict disciplinarian, hardened after years of dealing with Biff Tannen.