(From my viewpoint, this is a good joke because I get two of my favorite targets - the English and the Aussies - and before the Aussies come after me, I am happy to say that I found this on an Aussie website)

An Englishman consults a world famous surgeon. The Englishman says he wants to be an Irishman. The surgeon tells him: " This is a very delicate operation requiring brain surgery. I will have to alter parts of your brain and even remove some parts. There are no guarantees of success". The Englishman persists and so the operation proceeds.

After the operation is concluded, the Englishman awakens and sees that the surgeon has a horrified look on his face. The surgeon explains: " It was a horrible mistake but we seem to have removed all of your brain!"

The patient replies: " No worries, mate!"