Never ever, ever, EVER give lip to Fast Food employees. At least not until after you've gotten your food. If all they did was spit in them, you're lucky.
They're severely underpaid, underappreciated, and generally overworked (for the pay) employees. And many of them aren't the most well-adjusted teenagers to begin with anyway (especially the cooks -- otherwise they stick them on register), which is why they work at a fast food place and not at a better after school job. The bosses are usually total pricks (why else do they work at a fast food place and last long enough to become a boss) and make just being there almost unbearable. And, to top it off, the jobs are a dime-a-dozen and if you get fired you can go get another similar job across town without issue, so there's little motivation to stay on the straight and narrow.
I knew plenty of kids back in highschool who worked at places like that. I know better. Food first. Complain (if needed and worth the effort) after food is in hand.
As far as my dinner... Kung Po Chicken (extra hot). Mmmm.... Spicy, peanutty goodness!! Coulda had a fancy dinner at the Annual Meeting festivities (Duck, polenta, and a bunch of other awesome stuff), but I wanted to eat with my wife so we went out.