In Season 1 episode 5 'The Wolf and the Lion' of 'Game of Thrones', Sandor Clegane (Hound) saves Ser Loras Tyrell from Gregor Clegane (Mountain), when the Mountain attacks the Ser Loras and fights him until King Robert stops both and Gregor Clegane storms out in anger and Sandor bows to the king. Then Ser Loras declares him the winner of the Tourney.
It is understandable that Loras shows gratitude as he is in debt of Sandor but what right does he have to do so? There are other contestants also, why would they accept it? And I believe Sandor was not even participating.