Fans Fight at 49ers-Colts Game, Helpful Person Films It
Just kidding. I'm sure there is a perfectly valid excuse for grown men to engage in physical violence and get kicked out of a professional football game. Perhaps someone suggested Andrew Luck barks out the signals too loudly. Perhaps someone suggested Jim Harbaugh would make a poor dinner guest.
Whatever the impetus, cooler heads did not prevail.
[H/T: The Big Lead]