Two Englishmen, racing houseboats on an Australian river.. What could possibly go wrong? Big Fish to Rubber Ducky is about mateship; the kind of mateship that is fundamentally male. The kind that must compete, constantly, whether it's in business or on the road or at the helm of a three-tonne steel houseboat on a fast-flowing river. The kind that has women shaking their heads and wondering... Do boys ever really grow up?