Well, i thought i was all cool a couple years ago and didn't install the dork disc on a new bike i was building up, with brand new really expensive wheels. I guess i didn't quite adjust the limiting screws perfectly though... was fine on pavement and in the bike stand, but the first rough trail, and my chain went off the big cog and into the spokes, and utterly trashed nearly all the spokes on the drive side.
I guess i'm a dork