I attended this game:
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www.pro-football-reference.com]
Not the biggest comeback, but pretty amazing all the same. About 5 minutes left in the game, down by 10, MF just left the game with an injury, and the Rams had the ball at their own 5 yard line. Not only did they score 2 TDs to take the lead, but they left the Chargers about a minute on the clock to try to come back.
We were sitting in the last row of the dome, and there was a large contingency of Charger fans in the next section over. They left that game very unhappy.