Cat and Mouse
The leader selects on pair to be split into a cat and a mouse. The cat wants to be with the mouse, but the mouse does not want to be with the cat. This will lead to a room full of slowly moving pairs and a cat chasing a mouse around the room. Eventually the mouse will be caught and the cat and mouse join back in as a pair. The mouse still does not want to be with the cat. The mouse may reach out and join any pair that is milling around the circle.