R.A. Dickey pitches against the Miami Marlins at Citi Field....

R.A. Dickey pitches against the Miami Marlins at Citi Field. (April 25, 2012) Credit: Jim McIsaac

As if R.A. Dickey's pitches didn't move enough.

The knuckleball-twirling Mets starter tried a Wiffle Ball on for size during an MLB Fan Cave event at Tompkins Square Park. Spoiler alert: He's a natural.

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