Bump! Wow, like really
What do I do when no one is looking? I do dance moves. Mostly from ballet and ballroom. I never actually took lessons for either, just watched them on TV, read books about them, and then "practice" myself at home.

I love to do
grand jettes, or leaps where I almost do the splits in mid air. So much fun! Also
pirouettes, where I spin on my toes. I need more practice keeping my balance doing that, though. And commonly stand with my feet in
fourth position, to train my feet to turn outward (I do this in public sometimes, I bet some people think I'm weird, lol!). I also like to do all sorts of kicks. And if I'm really in the mood, I'll put on one of my costumes and just dance around. I love to waltz.
Speaking of putting my my costumes, sometimes I do that, too, if inspiration hits me right. I have a lot of costumes. Don't get to wear them very often. And sometimes I feel inspired to put one on and just wear it around the house for the day. I still like playing make believe, and it helps to be dressed for the part.
Sometimes if I'm thinking of something exciting, I'll get a rush of energy and I'll just start running for apparently no reason at all. When at home, I'll just do it up and down the hallway. But I've also done it in public if I don't keep myself in careful check, almost run into things (and people) that "come out of nowhere". And when I do it at someone else's house, I'm usually asked "Why are you running all of a sudden?" I then blush, smirk and say "Ah, I dunno. Just felt like it." I'm usually too embarrassed to admit what I was thinking about that triggered it.
Of course I also sing to myself, and talk to myself. But those are quite common, I see.