First, you go out on your balcony at your DVC home. You take a nice, cold [choose one: beer,soft drink, mixed drink], sit down and relax and enjoy the view. After a minute, the condensation from the drink will make your hand wet. Remove your hand from the drink, and shake it sharply to get rid of excess moisture. Place hand back on drink. Repeat "secret hand shake" as necessary.
Now don't go telling anyone else about this....it's a closely held DVC secret!
I forgot to remove my hand from the glass and started shaking it. Good thing I was out on the balcony. Ice flew ALL OVER THE PLACE! Hit a golfer looking for his ball under my balcony and knocked him out!
I always thought the secret handshake was when you raised your hand above your head and waved goodbye to the poor sap who is dropping you off at the airport on a 20 degree day in february....next stop VWL!!!!