All I can say is thank god for my mountain biking experience...

I was climbing the steepest SOB I've ever climbed. I was granny gearing it, just about out of gear as my whole body weight was on the pedals and the bike was barely moving. I was 2 feet from the peek when I heard a loud noise, and my whole drive train locked up. Derailleur had went into the spokes, locking up everything. I was able to unclip quickly, and get out very uneventfully.

Whoo hoo, go me!