BBC Sport marks Back to the Future Day by looking at four possible alternative endings to recent football history.
Today is the day Marty McFly and Doc Brown crashed the future in the second of the time-hopping sci-fi adventure trilogy.
So we ask what if Manchester United manager Alex Ferguson had been sacked in 1990? Or if Maradona's "Hand of God" goal at the 1986 World Cup had been chalked off?
How different things might be at Leeds United had Russell Crowe bought his boyhood club and what if title-chasing Liverpool captain Steven Gerrard hadn't slipped at Anfield in 2014?