What about Australia? No, I'm kidding, it's The Castle here too. Not that I really know anyone as dumb as the kerrigans, but it has a quintessential Australian sense of humor. "It's going straight to the poolroom"
Hmm, but would you really call them dumb? Unintelligent perhaps, in an academic sense, but I think they have some smarts.
To borrow from camlan, The Castle embodies so many ideas that are typically Australian.
Big things like mateship, sticking up for the underdog (like Laurie does with the Kerrigans, but also like the Kerrigans do with their elderly neighbours), being the underdog and coming out on top plus, of course, the Great Australian Dream - owning your own piece of land.
Then there's smaller things that are just a part of Aussie living - getting together with family, going on holidays (a funny 'You Know You're Australian When...' I once read said, 'You'll drive all day just to camp somewhere overnight'), the car culture ('Can you move the Camerra, I need to get to the Torana so I can move the Commodore.' 'Yeah, but I'll need the keys to the Cortina.' 'Don't hit the boat!'), multiculturalism, never ending renovations, and a million other things.
And underlying it all is this down to earth, unpretentious 'vibe' - where else but Australia would someone throw a backyard barbeque for their QC?