September 10, 1978: Raiders at Chargers
Ken Stabler deliberately (his own admission) fumbled the ball forward, and carnival-like antics by the Raiders propelled the ball towards a game-winning touchdown at the end of the game.
The next offseason, such an advance was made illegal. Now, a player who fumbles the ball inside of two minutes is the only member of his team allowed to advance the ball after recovering the fumble.
The venerable Jerry Markbreit was the referee.
Play begins at 1:57:30 if it does not cue automatically. [NBC Sports/NFL]