There's a lady whom I consider to essentially be a Second Mom. She's really been a good, close friend for a while now. Earlier today, it occured to me that I've probably accidentally offended her from time to time, so I approached and quietly asked for any forgiveness, and said a few reassuring things. She hadn't been expecting it, wasn't angry with me or anything, and nearly cried. As it turns out, the poor lady had been having a rough week, and from out of nowhere I popped up and said some very nice things.
If you ever feel like being extra-kind to someone, do it! You'll be surprised at how good your timing may be.