As the resident Yank at work, I receive a fair amount of grief. My co-workers think it's cute when I bring in a bagel for breakfast or peanut butter sandwich for lunch, fullfilling their expectations of the stereotypical american. This week I've recieved gentle teasing over the following slips as well:
Not ever having a "pavlova" a common Australian dessert of some kind.
Saying Xerox instead of photocopy.
Talking about the "weed-wacker", I can't remember what it's called here, whirly something.

The teasing is always good-spirited, and it's the aussie tradition to take the piss, so I'm not offended. More, just surprised by the little differences that attract their attention.