Riding home from work Thursday night, I had an issue. I know what happened, but I'm not sure why. If you're not interested in details about bike mechanics, you don't need to bother reading anything after this following paragraph.
Here's the deal for me... I flew over the bars, slid on my hands and elbows on the pavement for a bit (no gloves!), and decided to bleed for a bit. I limped the final mile home, and thanks to Jean's urging, made sure not to bleed on anything in the house. Oy! We cleaned and dressed my wounds and the next morning the wonderful nurses at Beverly Hospital finished the job. I've been dutiful in my wound care, keeping them clean, covered, and moist, all to promote healing and reduce the risk of infection. In fact, with my hands wrapped correctly, and covered in good gloves, I can even hold handlebars!
Okay, so here's what happened. Somehow, the lockring on the rear cassette backed out/loosened up, allowing the smallest cogs to come off the splined freehub body of the rear hub. Unfortunately, this didn't happen slowly... it happened SUDDENLY, and while I was cranking up a short hill in the big ring. The sudden loss of resistance from the rear wheel flung my weight forward and put me off balance enough to result in my graceful splat. C'mon epidermis, grow!