Originally Posted by
toytech
I had a rear snap off and go into the spokes causing a rather spectacular crash involving a front flip. I was fine the bike decidedly not.
I have forgotten to tighten the stem on my own bike a couple times too, that's exciting

Not to be picky, but you very likely have it reversed - the rear went into the spokes and snapped off. That is why I always shift to the large rear cog at the beginning of every ride.