A convincing Aussie accent is many things, but I don't know if I'd call it proper English. Depends on where you fall on the Yob - Wanker scale I suppose.
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I used to work at a Sam's Club and you could always tell the first timers. They'd be standing out front with a dazed look on their face with a year's supply of toothbrushes and a vat of mayo in their cart.