I seem to recall there was some baseball player who dislocated his shoulder, then popped it back into place by slamming it into the dugout wall. My friend says I'm crazy and that that was from a movie. Help us answer this pressing question. Bonus points for providing video.
You should probably try to compare Dunn to a more fringe candidate, not someone who's going to be considered (if not already) one of the five greatest hitters who ever lived. Otherwise you're stepping into Joe Morgan territory here.