The US is definitely the big one, many states here have something called "tip credit", where an employer is legally able to pay under the minimum wage (as low as $2.13 an hour) on the assumption that customer tips will make up the difference. To make it even more odious, waiters in particular are usually required to kick back a percentage of their sales, usually around 5%, to the bussers, cooks, hostess, etc regardless of what they were actually tipped. So if you eat a $100 dollar meal and tip less than 5$, you actually just took money from your waiter, he'd have been paid more not to serve you. Now I happen to think tip credit is an illegal subsidy of the restaurant industry, but I also think that failing to tip absent extreme circumstances is tantamount to theft of services, and if customers who make a habit of doing so ocasionally ingest substances not approved for human consumption as a result I'm not going to shed any tears.
_________________
Your boos mean nothing, I've seen what makes you cheer.
- Rick Sanchez