R.A. Dickey spent all of last season confusing hitters with his knuckleball. Based on this gif, he also spent a lot of time confusing the hell out of his catcher. It can't be easy to be back there with Dickey (or any knuckleballer) on the mound. The ball does weird, fluttery things, and there really is no way to know when or where it's going to break.
But seeing it in slow-mo like this really gives you a new appreciation for how mind-boggling the knuckleball really is. This should make opponents of the Blue Jays a little uneasy about Dickey heading the AL next season.