From Dirk Hayhurst’s blog (whose books you should absolutely order; they’re good reading), here’s a 1:35 minute video of R.A. Dickey’s knuckleball being shot from directly over the shoulder of his bullpen catcher.
Serious question; how do you possibly hit this? He throws it in excess of 80mph and it moves this violently? Amazing. Its no wonder he won the Cy Young last year, and I can’t see him being appreciably different in 2013.