Torched my Ultegra rear derailleur yesterday in mud over my rims, which didn't even look that wet until I was buried in it. Somehow picked up a rock, which went over the first pulley, locked up the drivetrain and yanked the rear derailleur OVER the rear axle. I had two gears coming home. At least the chain didn't break!
Ran 2 before the ride, and one after, just to make sure the tank was empty. The legs still felt amazing though, even though I'd gone 30+, the first half into 20+ sustained headwinds. Feels good to know I'll have some punch when I get to the start line. Just need to start going a LOT longer to be sure the punch will be there at mile 195!