Frasier's upstairs neighbour Cam Winston is causing more problems when his washing machine leaks into Frasier's apartment. Frasier gets the water to Cam's apartment shut off, causing their feud to escalate. Martin and Cam's mother believe the feud is childish, so they pretend to be having an affair in order to annoy Frasier and Cam. Meanwhile Niles has agreed to an experiment in which he must go everywhere on a Segway instead of walking.