I used to smile a lot in my videos, I think. I also messed up like a motherf-... Er. I'm so glad I know how to edit now. Anyway, that's what YouTube is all about, having fun, and showing genuine emotion in your videos. Even if you're p****d, show it in your videos. It makes you come off as much more real and such.
YouTube can be hella weird, and flat out annoying at times, but you can't deny its charm.