A guy I used to work with was the first person to ever groom shays, and he told me a story about the first attempt to groom it. About 1oo feet from the bottom it broke loose and all he could do was dig the blade in as he was heading for the drainage ditch in hopes of cushioning the impact with snow. Instead the snow mushed into the ditch and created a mini lip that launcehd the groomer four feet into the air. I don't know if this is actually true or not, but still a good story.
