Yeah, it happens to me, too, caffeine or not! It does look scary. And I also get the eye twitch, which isn't usually visible to anyone, but I feel it. But after I gave birth, I became extremely twitchy (all over my entire body!). Very diconcerting. I even had an MRI which revealed nothing. My neurologist said that some people get them, and they're called benign fasciculations. Sometimes, my finger or eye gets a twitch that lasts for days.