Whilst sitting down, my leg will NOT stop bouncing. When it's a subconscious twitch or when it's deliberate, I can't stop.
Whenever I'm sitting at a table with my dad, he'll always tell me to stop it (as it apparently shakes the table), and I'm like "stop what?"

I do that too! I always swing my legs when I'm sitting on a place where my feet don't touch the floor.

I always touch my left earring when I'm stressed and I don't do it on purpose !

This.

Me, too.

I always put my shirt over my nose when it's blocked. It doesn't make a difference, but it DOES IN MY MIND OK.

I have quite a few:
. When I start tapping something, wether it's with my hand or my foot, I can't stop until the pattern is complete, which it never is. So I just break off until it starts again. I mostly do this if I'm thinking.
. I also swing my legs if they don't touch the ground.
.I think that everyone on the site looks like their AV, except enigma because I've seen his face. (When reading an earlier post I thought that BBblader was a girl. No offense.)
.I do the no-opening-your-mouth yawn all the time. Then I wonder why my mouth didn't open... Am I weird?
.
Same here.
.Whenever anybody says the words "itchy head" my head is suddenly itchy.
Wait... Am I a pony to you guys?

Me too ! And when somone change his AV, I feel a little lost...

Poor Unas.....
But I have to admit, that I do the same. I am not a giant blue textbanner!

I go by the AV=Person in real life too.

My insane little habit is saying excuse me every time I burp. I got into the habit purposely so I would never be looked down upon as rude, but now it's gotten out of control. Even when it doesn't come out, I still say it. And when I'm alone, I still say it.

Am I to infer that you see yourself as a cute little Penguin then, Mii-sama~?

No. I'm still Kikyo. The evil, jealous, clay-zombie she is.

I find myself constantly holding my breath for spurts of time so I can concentrate harder. Every now and then, when reading or something, I'll realize that I've held my breath for longer than I typically would be able to without even paying attention to it.

You must have great lungs.

I actually used to do this. It usually only happened when I was deep in thought or playing a video game at an intense part. I actually forget to breath and then when I'm back to my senses I realise that my lips have actually turned blue from not breathing.