Yes, it's old. I was in first grade when this happened. But I've never even heard of this. How many of yous guys remember?
On April 25, 1976 at Dodger Stadium, Rick Monday of the Chicago Cubs, grabbed and secured the American flag from two muslims attempting to burn our flag in the middle of the playing field. It was an outstanding display of American Patriotism.
UPDATE: Ace of Spades commenters continue to be the best truth-checkers and editors.
So, CORRECTION to the youtube description: they were not muslims, but an ordinary hippy-commie and son.