Karl's beautiful accent

What has happened to Karl's kiwi accent between this interview and more recent ones, such as this one??? Why has he transformed himself into a Man with an American Accent?

Why, Karl, oh why? Whativver heppened to your Nyew Zealund eccunt???

*is stricken*

(Yes, I hereby admit that I just scoured youtube for interviews with Karl Urban. Why did we not have this facility for lotrips??!)