Originally Posted by Kevbo
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.
Can you twitch the appropriate muscles to make your butt flicker like a firefly? Calvin (of Calvin & Hobbes fame) tried this once, and wasn't able to figure it out.