I had finished Shadow of The Colossus twice before. I knew how it always ended, how it had to end.
The third time I played that final scene I realized that I could still whistle for my horse. It's revealed in the cutscene following the confrontation with Lord Emon that your horse has somehow survived a drop into a ravine, I thought "maybe if he's alive and I whistle for him..." and so I whistled, I whistled and whistled, fighting the inevitable pull of the vortex behind me, it let me get as far away from it as I did, it didn't matter, it would always get me in the end.
After about 15 minutes of fighting, tired and worn down, I gave up for the third time and was dragged into the vortex. As I did so I marveled at the game's ability to still give me hope for a different ending after all this time.
I know the game has to end like that, but I always hope that someday, somehow, someone will find the trick to getting a happy ending.