I shaved my beard Friday after having it for a year and a half. At my daughter's soccer game, I walked up to one of the other dads (who'd only ever seen me with a beard) and started talking to him. During our strangely odd conversation, my wife walked up to me. Then he goes, "Oh hell, I didn't even recognize you until your wife walked up."
It wasn't like I had some Grizzly Adams beard. It was always fairly manicured. I never knew I had an incognito mode.
I can only assume that's what Clark Kent goes through when he takes off his glasses.