I'm really ADHD sometimes. :s Like, I cannot stay still. If I'm ever just sitting or standing, I'll rock on my heels, swing my arms, snap my fingers, rock from side to side, anything so that I'm not still.
And whenever I'm walking down the hall (i.e., to/from lunch) I always run my hands along the wall. I know it's kinda gross because it's not like they actually clean the walls, but I just can't help it.
Also, if I'm every having an imaginary conversation in my head, I'll start mouthing the words and making expressions to go along with the conversation.