Oh God. Don't show me that. I might start doing that. I seem to wink here and there and I wonder why. Why am I winking as a response, when I don't even like to wink.
That would be another knee-jerk gesture that I would feel stupid doing.
As a kid, we did that to feign shooting at each other in various forms of make-believe. Now if I use it it's tongue-in-cheek. It's not a gesture that comes naturally to me :P