McGaw's try in 87 to win the game. There was no safety net back then so credit to Mick Stone for getting the call spot on.
Otherwise there was the 2002 Lockyer 'No Try'. Langer grubbers into the NSW in-goal, Tahu knocks the ball forward, Locky leaps up above Hodgson and miraculously plants it down before the in-goal and the video erronously denies the try and gives the ball back to NSW.
It's a try that should have gone down in the annals of Origin history.