Americans are often surprised (if not downright *disappointed*) when I say I'm originally Australian, largely because "but you don't have an accent!" (which leads to me explaining in-depth that Americans are way too friendly with strangers and I don't wanna play 20 questions five times a day)

Australians though, they can just administer the Voight-Cuntt test

"You're at the beach, walking along the sand when all of a sudden you look down and see an iced cold Farmers Union Iced Coffee"