The Universal Language of Manicure?

Let's say there's a guy---hypothetically---and this hypothetical guy goes to get a hypothetical manicure once every few months or so---hypothetically speaking, of course. Now, while this guy never patronizes the same hypothetical Vietnamese manicurist shop/salon/slave factory each and every time he gets one, there is a ritual flourish that seems to be followed no matter who is performing the manicure. The part in question is at the conclusion of the wonderfully delightful and moistureiffic hand massage (or so this gentleman might exclaim). When each hand is done, the manicurist makes a fist with her hand and then gently pounds the top of the guy's hand--twice--as an obvious symbol of her having finished. This is not unlike a card dealer doing his fancy hand maneuver right before he is replaced by another dealer. I guess my question---err, my friend's question---is this standard? And by standard, I mean does it always happen this way...with the fist pound?