Originally Answered:

What are some major social faux pas to avoid when visiting Australia?

Sitting in the back seat of a cab. I occasionally see Indian cab drivers unaware of the unspoken egalitarian norm here, hurrying to clear their crap from the front seat. But by default, if you sit in the back seat of a cab, you are taken as treating the cab driver as the Hired Help.

And yes, the cab driver is the hired help. But woe betide you if you actually act like it.