I write stupid letters to friends every so often, or mail pictures of a carrot I've drawn. It's at no cost to me as I use envelopes from the office, and sometimes postage, too. It's usually to someone who'll get excited about a handwritten letter, open it up, and see something they think a fourth grader drew. Naturally, they assume it was me, and give me a call. I guess I could have called them first, but that seems like more work.