I have two kinds of spasms the ones i want and the ones i don't.
My eye twitches sometimes but it starts off as me "wanting" to twitch it, like wanting to bite my nails, then i twitch it and it feels better.
The other kind's like parts of my neck and right hand, sometimes i feel this huge vein just bulging in and out out of my control, I think that's just an involuntary muscle spasm, I hope...
Might as well start imitating elvis now while you have the "gift" heh