I sing at my church on a fairly regular basis. Last fall, a woman came up to me after Mass and introduced herself as coordinating the Bible study group at the juvenile prison. She asked if I would come and sing for them. I went, though I wasn't sure whether I'd really reached them or not. I guess I did, because the next week I got a thank-you card that they'd all signed with the most beautiful messages, and they all keep asking her when I'm coming again. (I've been five times now)