Aw man, I've got an involuntary eye twitch today.  Those have seriously got to be one of the most annoying things for sure that can randomly happen to a human body.  It's not at all painful, just sheer irritating.  Hiccups would probably rank up there, too, although drinking some water will usually do a pretty good job of dousing those.  There isn't really an equivalent to stopping an eye twitch, or any other muscular twitch.  I've had them in my legs and other places before.  You kind of just have to ride them out.  I mean, yeah, I'll take it over a bajillion other things that could go wrong.  That's why I made sure to categorize it as annoying and not tragic of life altering or anything like that.