Having experienced a lifetime of generally good natured and sometimes not so good natured banter between Aus and NZ, I thought I had heard it all until watching Flight of the Conchords Season 2 on DVD recently.
The 'Unnatural Love' episode was a landmark development in trans tasman wisecracks and had the best line since New Zealand Prime Minister Rob Muldoon in the 1980's, when asked about the immigration of New Zealanders's to Australia, replied that the IQ of both countries was raised as a result.
Best line - Jermaine and Bret in discussions to establish whether the woman Jermaine had slept with the previous night was in fact Australian - She had an accent like ours (NZ)...only more evil.
Classic.
http://www.youtube.com/watch?v=hoF_fa9TMDk