So I was riding back home from a short ride to the grocery store, when I came to a four way stop sign. A car approached the intersection from my right, and it stopped before I did, so I came to a full stop in order to let her go.

Now, she waved me on, telling me to go first. So I did, except I didn't. I have pedals with straps, so I was strapped in, and I was kinda just balancing at the stop sign. When I started pedaling, I felt my whole drivetrain freeze. It sounded like my rear wheel started to move (or maybe not) then completely froze. Of course, I was strapped in, so I fell over. Nothing too bad, just the typical bruised knee/hands/etc.

I can't figure out what happened, however. I took a quick look at the rear brake and it seemed to be gripping the wheel very hard, like it didn't let go of the wheel even after I let go of the brake. Any thoughts? I'm kinda sad it happened, I just bought a brand spanking new water bottle cage and now it's all scratched up. :(