Best done outside (or in a room with an easy-to-clean floor), doughnuts on a string is sure to thrill all your party guests. Tie a length of rope between two trees or two sturdy indoor structures, then tie pieces of ribbon through the holes of the doughnuts to the rope, so they hang slightly above mouth level. Players have to eat the entire doughnut, without using their hands and without letting it fall off the ribbon. The first to finish wins.