Behind the times.
Ok, I'm going to admit what a moron I am. Not that you may not have noticed before, but I am.
For years now, I have always heard people say that they sent something via "snail mail", and I had no idea what that meant. And I was too afraid to ask. I thought maybe snail mail was a group email. Or instant message thing. Yeah, I was wrong.
I finally looked it up on Wikipedia and now am enlightened. Next time I should just ask.