I have to say, I’m not a fan of this suggestion from Kirk Goldsberry, to make the refs throw different colored flags depending on if the penalty is on the offense or the defense.
Because you know what really gives me goosebumps during a game? When Jeff Tripplette throws a ticky-tack flag on the defense during a stellar touchdown play, so that the crowd is nice and subdued while we wait for the refs to confer and Tripplette to finally announce the penalty that will be declined. I just love watching referees work!