South Australians always use the long ‘a’ in words like ‘chance’, ‘plant’, ‘dance’, ‘graph’. This is sometimes heard in other parts of Australia but in most places the short ‘a’ is more common in these words. All Australians, however, use a long ‘a’ for ‘can’t’.
Some South Australians claim that with their accent, they speak in a more refined, ‘proper’ way. Given the way 2004 housemate turned host Ryan Fitzgerald sounds, I would say that there’s a broad continuum of South Australian accents, many of which are far from refined. I’m no expert but Fryzie certainly seems to have a few key South Australian characteristics like the long ‘a’ in ‘chance’, but he is still very broad. (Same goes for New Zealanders!)
Another supposed South Australian thing I have heard of is that when they say ‘wheel’, it sounds like ‘wool’. Maybe Ed’s ‘gewls’ (girls) is due to this general characteristic?
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Some excellent Australian films are being listed here.
‘The Castle’ is brilliant. Quite Melbourne-centric but I’m sure anyone would get the jokes. I’m very impressed that someone mentioned ‘They’re a Weird Mob’ (1966). Though far from the greatest Powell and Pressburger film it is still very enjoyable with some great moments, even if it gets a bit lost towards the end. It focuses on Australian customs and slang but most of the terms heard in the film are extremely out-dated now. And yes ‘Malcolm’ (1986) is great (and very Melbourne-centric).
‘Pure Shit’ is a great 1970s drug classic made in Melbourne. I love it but it might be hard to find.
Some great Australian exploitation favourites of mine are:
‘The Man From Hong Kong’, ‘Dead End Drive In’, ‘Number 96’

(film and TV episodes on DVD).