Yeah, in 1984, David Lange banned nuclear-powered or nuclear-armed ships from entering New Zealand's territorial waters, and this basically banned the US Navy from using our ports since they won't confirm or deny the presence of nuclear weapons on their ships. It all came to a head when one US ship in 1985 requested a port visit ... obviously it was refused, and the US threw a hissy fit. Lange stood firm and basically told them to get fucked, it's our sovereignty and we'll do what we like with it, thank you very much. So the US, ever so mature when it couldn't get its way, suspended its ANZUS Treaty obligations towards New Zealand.
There has been something of a thaw in the last few years (I remain disappointed in the 2010 Wellington Declaration), but I'm still waiting for the American government to apologise for behaving like a child.