You all have covered most of the great ones (when Rock OWNED Toronto is among the best heel promos ever... ever).
The one I didn't see that comes to mind is The Rock talking with The Coach about the Coach's special cow Bessy. Just another example of The Rock doing a promo about NOTHING to do with his match, and yet being hilarious.
https://www.youtube.com/watch?v=rTAVYTN4PpU