Slow rotary wood splitter. These are their own kind of dangerous, but they do look more reasonable at a slower speed. Of course, as tradition requires when posting woodsplitting vids to the net, only the most easily split pieces of wood are displayed.
Horse-powered log splitter
Hinged overhead wood splitter - GIF
Slide action wood splitter - GIF
Splitting bamboo - GIF and video
Cone splitter for splitting wood - GIF
Double-handed wood splitting mayhem - GIF