I don't know why this article thinks only actors say "break a leg". Here in Australia it just means "hurry up", or "get going", and can be used in any situation which requires you to get moving somewhere.
I hated trying to work out the price of things in the US. Annoying little pennies and random unlisted taxes as you pass through states. In Aus all prices must include taxes, and everything rounds to the nearest 5c when dealing in cash.