Doughnuts on a String is "bobbing for apples" in reverse. Instead of dunking your head into water, you're stretching as high as you can to nibble on dangling doughnuts. The doughnuts bob and sway, which is challenging enough, but then add the extra touch - NO USING YOUR HANDS. Make sure you string up plenty of doughnuts, because everyone will want to do this more than once, guaranteed.