"Two nations divided by a common language."
There are certain subject areas where terminology differs much more than others. Food comes to mind, and I can still recall a conversation with a 13-year-old girl in Georgia some years back, which as near as I can remember went something like this:
"Chips in England are what you call fries."
"So what d'you call chips then?"
"They're called crisps. And cookies are called biscuits."
"So what do you call biscuits?"
"Well....."
And so on. I still remember the peculiar look and the "Gee, I thought y'all spoke English over there!"