If I can think of something funny on the spot and laugh a little bit I feel less creepy, but sometimes it’s just difficult to do that right then and there.

As for bearing(?) the teeth, a few times I caught myself doing this unintentionally as I get older; I always feel like an idiot afterward because I’ve always known this isn’t the way. It could be due to the fact that I’m (happily) rarely involved in these sort of photos as life goes on.