This could only happen to me.....and makes me go hummmmmm...

So I'm at my friends, picking up some pix he printed.  I was also, a-hem, chatting. :)  I was chewing gum.  All of a sudden, out of NO WHERE, my jaw sort of 'popped'.  It wasn't like a big pop, it was more of a shift, a muscle spasm, a weird phenomena (did I spell that right?)  It was painful, and took me off-guard.  I continued to talk of course and didn't think much more of it.  I got to my car and noted that my teeth are now not lining up!!  REALLY?????  I've been massaging the joint, 'relaxing' so to speak (clenching due to xhtml home work probably doesn't help), and trying to get it to 'pop back'.  I'm not in pain; but to the touch, the left jaw is sore.  (the right side popped.)  But I wonder if I'll have to have my boss 'pop' it back or what.  Maybe, Lord willing, it'll just slide back while I sleep.  HOPEFULLY!!!!