My kid asked, 'Why do we have to say Merry Christmas to the mailman?' I said, 'Because he's delivering our packages and it's the season.' He said, 'He's delivering packages. That's his job. I don't say Merry Christmas to the person who mows the lawn. I don't say Merry Christmas to the guy who fixes the gutter. But the mailman gets a Merry Christmas because he's the only one who shows up in the snow, and I can't say thanks for not throwing the package at me, because that's not a greeting. That's a witness statement.'