Left trigger to swim at the end just might be the best single button press in video game history.
I wholeheartedly agree. The sense of loss you feel when the left stick and trigger don't do anything really drives home the point that something is missing. The whole game builds the idea of the 2 brothers and the 2 analog sticks being complimentary, then when the older bother dies it expresses it in SUCH a powerful way. I agree with Patrick, only a game could have expresses what Brothers did. Before the swim moment, touching the left stick made me sad; it made me miss having the other brother there. I even took my left hand away from the controller a few times. When the left half of the controller started rumbling faintly a light bulb went on, and I had a big "wow" moment.
GOTY idea: best use of rumble.