How do you castle in one smooth motion? One time I saw GM Gawain Jones playing a blitz game where he castled by placing one hand on his King and Rook. With a quick twist, the pieces were in the castled position. It happened so quickly, I didn't quite see how he did it, but I was mighty impressed.

Normally, a player will move his King, then use the same hand to move the Rook afterwards, but has anybody else seen (or done themselves) a one-motion castling?
I do this often in blitz, although it is considered somewhat inappropriate in a tournament setting.

The quick way to castle with one hand is to make a motion where you "capture" the rook. In a typical capture, you pick up your piece and knock the opposing piece into your hand. You then take the piece off the board.

What I mean by "capturing" your rook is that you perform the same motion, but instead of using your palm to carry the piece off the board, you use it to guide the rook to its appropriate square. At the same time, your king is knocking the rook over to where it belongs.

It takes a bit of practice to knock the rook over, but when done properly you can castle in a fluid motion without having to make multiple motions with your hand.