Probably the biggest surprise to me about being a priest is just how little it matters on the one hand, and how very much it matters on the other. When I go to the grocery store, for example, no one would know I'm a priest. But I know, and so I find that I keep checking myself: just this.
The way I look at it is that they don't have to know I'm ordained; but if they were to find out, they shouldn't be surprised by it based on what they see. Now that I think about it, that's a tall enough order to keep me on my toes for quite some time.