So on this wet and cool day today I'm going along and hit a quiet stretch of road. Came off the stop sign and while going about 15 I twisted the throttle a bit for fun, like I've done a million times. Bike revs up and before I hit 25, still in first gear, the rear wheel pops free, spins up and I had that moment of Oh Shit. Rear end wiggles off line. Stayed calm and rolled off slowly, and no drama. I've never been able to pop that wheel loose before while already moving, but the rain and road, and maybe some unseen oil, and wham. Ride PR4's, so good tires but not racing tires. Glad it was over in an instant and didn't result in me doing the flying monkey routine!