Nothing, it’s silly talk. Specifically to Brady and Manning though I go back to some great insight that Eric Mangini gave on NFL Live a few years ago.
His main points: you must disguise pre-snap, “if you’re not lying, you’re not trying”. Having a different game plan to start the second half to give Brady/Belichick something to think about and then going back to the stuff that was working in the first half. Finally, long sustained drives on offense.
Watch the 2010 Pats-Browns game to see this game plan executed perfectly. Also helped that the Pats didn’t show up to play that day.