They say you should never give up in life, and no more does that apply to the world of sport.
Hard graft in training, a will to win on the track or pitch... but persistence in argument is rarely lauded as a positive trait.
David Storl, Germany's world shot put champion, proved otherwise on Friday as his nagging earned him a gold medal in Moscow.
Storl had just thrown 21.73 metres, which would have put him in first place. He was clearly delighted with the effort, and reacted furiously when the judge raised the dreaded red flag.
But the German was convinced it was a good throw, and made his feelings known in an extended discussion with officials.
Eventually he pointed to a photographer sat beside the cage, and after close inspection of the pictures he had taken, officials finally agreed the throw was good.
That was in the fourth round - and it went on to be the winning throw.
So for stubborn so-and-sos all over the world, David Storl - take a bow.