It's not every day you have the chance to save a life. I donate blood as often as I can manage, which is pretty often, because there's a drive with late hours that happens regularly a few blocks from my house and I'm fortunate enough to be eligible to donate. And it's an absolutely stellar excuse to take knitting and a book, and go avoid housework for a while.
I knew I'd been doing it for a while, but hadn't realized I had hit another milestone until yesterday.

Cool!