The archetypal New Zealand joke is:

"New Zealand - where men are men, and sheep are nervous."

To NZ, Wyoming and Wales we may have to add the SAS. During the campaign against insurgents in Oman in the seventies, in which British Forces were involved, the local Army was dependant for meat on the local herders. A wily local shepherd came and complained, as delicately as he could, that his flock was no longer available for human consumption as an SAS soldier had been seen interfering with one of the sheep. Horrified, the Armed Forces (prepared to believe anything about the SAS) compensated him the full value of the flock and instituted an internal inquiry. The shepherd departed satisfied. The army remained meatless and increasingly restive for several days until a second shepherd appeared, bearing a strong family resemblance to the first, and offered for a much elevated price his flock, which also bore a striking resemblance to the first. The Army, by this stage facing near mutiny, was in no position to refuse the offer.

Sorry, this has nothing to do with worst lines, but it's probably worth a song.

But what about:

God didn't make them little green apples And it don't rain in Indianapolis In the summer time