For you knuckledraggers that don't know, that would be the "Mallard Club" salute. It happened like this:
Me: "Okay, there's some pictures for the family to see, now give me one with the mallard club salute."
He thinks for a minute, then a light goes on and he says: "Oh, you mean like this?"
I start laughing and said: "Exactly."

McLintock, great party, but no whiskey. We go home.