I was full of good things and great observations throughout the day. Then I came home and discovered that I hurt someone terribly. They did a very nice thing for me a few weeks ago and I never thanked them. At all. I thought of them, thought of how to thank them, but never did. And now nothing I say or do will make up for the fact that I didn't take two seconds to even acknowledge the thoughtful thing they did for me.
None of today's good things can balance that out.