What in the world is this?

<font color="#880000"> I remember throught my life I'd be doing something or thinking about something and I'd get really excited over it and my jaw would tighten up and I'd often do weird things such as bringing my hands up under my chin and pushing them against my chin.

Or even sometimes I'd put my hands under my chin and just wiggle my fingers outward from my chin. I never knew why. I would do it and not notice it and my friends would always laugh at me.

I never knew what it was. I get it sometimes, even while writing things online or doing something I think is really cool. I can't control myself from doing them.

Anyone know what that may be? I haven't heard anything like that. </font>