I had a dream that I was watching a replay of some Olympic-type event. Kind of a combination of figure skating and some sort of engineering contest where you made robots, except that you were an important component of the robot. In essence, you sort of wore the machinery, building it around you, and then skated. The guy who was skating had some sort of large buzzsaw blade (just the spinning round blade, not attached to anything) that had flown off and was sort of hovering a few feet from him as he and it zipped along, and then the scene went into slow-motion because something important was coming up.
Which was
that someone else was on the ice, leaning over the wall and chatting with the crowd, until the buzzsaw blade sliced him in two at the waist. (Very neatly, too, and without the mess and spurting blood that I would have expected.)