Had to happen at some point, right? And I wondered why the gears were jumping so much :)
Put it back on and tightened everything up, and it rode much more smoothly!
A few years ago I was in a cycling class where we were all on Kurt Kinetic trainers. There were about 20 of us? Guy came in late and quickly got his bike set up. During the first set of standing sprints he fell over. I'm not sure if the bike fell out of the trainer, or he just has really bad sprinting form and took the whole thing over. Regardless, it was the first and only time I saw a three bike "pile up" in an indoor cycling class. Thankfully no one was injured and no bikes were damaged. Just some severely bruised ego.
To this day I probably over tighten on that rear skewer.
That's really funny - I can totally picture it. And it's pretty much exactly what happened to me. I had been using my mtn bike on the trainer and had that one pretty dialed in, but just sold it last week (am eagerly awaiting the arrival of my new one!) so threw my other bike on, and the set-up was just different enough that I had to tinker with things a little bit. Got it on in kind of a man-handled sort of way but clearly didn't tighten it up enough. And then on one of the standing intervals, it popped right off.
Luckily, the trainer is sandwiched between the treadmill and the stationary bike, so I was able to grab onto something and easy myself (and the bike) down.