It's not a finisher, but does anyone remember the face-spot Rock used to do in which he'd throw a series of right hands at his opponent's face while backing them into the ropes? Then, amidst the flurry, Rock would pause, spit in his hand, and throw one more punch that would send the other guy over the top rope.
I always thought that move sucked until I saw him do it on Big Show. That took it to a whole new level. They did a lot of stupid shit with Rock's character, but that was at the top of the list.