Somewhat off topic... the act of tipping should be abolished. In Europe it's an insult to tip at a restaurant.
Why should someone who simply walks back and forth carrying food should get extra money, all while the person doing similar physical activities in retail gets nothing? Also when I worked at McD's as a kid ... I busted my butt and worked way harder then the waiters at a sit down place which is way more laid back. It's such a silly cultural thing that should stop.