Here's a random tidbit that I couldn't find a place for in my upcoming book on Colts history.
Not only did Peyton Manning surpass Jim "Captain Comeback" Harbaugh for most comebacks as a Colts quarterback, he did it by the end of his second season in the league. That's impressive, but what's really amazing is that Manning, author of 35 fourth quarter comebacks (2nd most all time behind Dan Marino at 36), has more 4th quarter comebacks than all the Indianapolis Colts quarterbacks combined.
Since the team moved to Indianapolis, the Colts have had innumerable QBs, and together they combined for 30 fourth quarter come from behind wins over 14 seasons. Ten different quarterbacks contributed to the total (and there were a lot more that didn't contribute anything).