There have been some big blunders in big games, but last night we might have seen the biggest in history. JR Smith got an offensive rebound with game 1 of the NBA Finals tied between the Cavs and the Warriors. We all know what happened after that. Smith didn't know the score in one of the biggest blunders in a big game in the history of sports. Check out the play below and the ensuing reaction from LeBron, JR, and Draymond Green.