I fulfilled a commitment. I said I would do something, and that I would be somewhere at a certain time, and I did the thing and then showed up where I was supposed to be even a little bit early!
This is huge for me. I normally never ever ever make a firm commitment to anything, because I'm not so sure I will be able to follow through. Making and keeping a promise is a neat feeling, like yay! I did a functional adult behavior! lol.