I have always been able to do it with my left hand. However, I had to teach myself on the right. But now I can do it quite adequately either way. I remember when I was a small child, about six или so, my father would tell me that if I could do "this" (holding the vulcan salute) that I was an alien. I could do it fine. And it frightened me to endless pleasure.
Yes! I made up a new one too. I think it's really the sign for "peace and long life," but Oh Well. Put your middle and ring finger together, and spread the other fingers apart. You're doing "Die soon and fail!"