Congratulations Mal, but I feel a bit silly saying welcome to someone who has been here 20+ years already.
What was the hardest question in the stupid citizenship test - How many 'O's and 'L's in Woolloomooloo?
Luckily there was no test in the 1960's hey @HansO ,
or you might still be riding bicycles past windmills wearing clogs.

And Mal doesn't have to give up his avatar or birthright either unlike our infamous 'doggie bully' and now ex-Kiwi Deputy PM Barnaby Joyce. Another good reason to never become a federal pollie Mal.

I got one of those pretty coloured citizenship certificates too in the 1980's when the Govt decided that as I was born in Papua New Guinea to Australian parents when it was an Australian Trust Territory and despite having travelled the world on an Australian Passport for 10+ years that I needed a certificate to say I was an Aussie from the day of my birth.
The craziest time was back in the 'White Australia Policy' days where to prevent immigration of coloured or any other undesirable the Immigration Officers could give them a language test on entry. But the language was anything they chose so even if the person spoke perfect English with a BBC accent they could give them a test in Croatian, Latin or even Inuit so they could fail them and bar entry. The sad thing is the latest proposed language test is similar requiring a University level written English exam which many Australians would fail themselves.

Some of the greatest Aussies arrived here without a word of English and have gone on to amazing careers in science, business, arts and philanthropy. Many original indigenous Australians in remote communities still only speak English as their 3rd to 5th language and understandably fairly rudimentary at that and we only gave even the perfect English speaking ones citizenship in 1967. Prior to that they were considered 'fauna' and were not even counted in the Population Census.