A friend of mine is from Australia. Tips are included in the tab there and she was horrified to find out (after she questioned why I left so much money on the table, most of the time people don’t leave cash on a table-just put the tip on the card receipt) that not only do waitresses and waiters make like $2 an hour instead of the minimum wage, but that the gratuity is not included in the check here in the states. She said “Oh my GOD! I’ve been shafting people for months now!!”
My cousin from England was really amazed when he visited Orlando a few years back that everyone expected a tip.
I had a Norwegian classmate who used to do the same thing until the first time we went out to eat together and I schooled her on our customs. Turns out she’d been leaving a dime or quarter for her tips!