With a bit of feedback (like standing in front of a mirror) it is often possible to train yourself to move and control things that you formerly couldn't. I taught myself to make my heart skip a beat when I was a teenager for example.
I think we all have the nerves and muscles to do such things, but there is no reason for most of us to learn them, so only a few random people get the innate ability to consciously do it. SWMBO can't wink, but has exceptional control of her toes. I'm pretty sure she could learn to wink if she worked at it, because she can close one eye slowly, just can't manage the quick wink thing.