Is it hard to touch your thumb to your pinky?
This has been a thing for as long as I can remember. There's no "hold up three fingers" so much as "fold your pinky halfway down and try to pull your thumb in without dislocating something." It's never come up as a problem with any other kind of gesture, but the number three is hard and the Hunger Games salute is totally impossible. It's twice as bad in my dominant (left) hand. I know it's not normal per se, but pick 'yes' if you personally have or have had this trouble.