I don't normally frequent the forums, but in this instance, I've got to chime in. While I was i high school (and for a couple years after graduation, before college) I worked as a chef. Generally, I didn't have to deal with front of the house stupidity (at least relative to the wait staff, hostesses, etc.). However, at one point I worked in a hospital's kitchens. One day they were shortstaffed in the cafeteria sections (think a mall's fast food court) and asked if a few of us could cover.
In any event, I'm now chilling in a Quiznos, popping out sandwiches. There are four stations in this mini food court, a Quiznos, a little burger grill joint, a salad station, and a smoothie shop. They form a simple 'U', and all the menu's are displayed not only back wall of each area, but on the little glass sneeze guard positioned, at most, A FOOT AND A HALF from the customer's face. Yet, and I shit you not, over two hours, I recieved requests for fried chicken, tacos, and LASAGNA. This is a Quiznos, we sell submarine sandwiches, that's it, nothing else, stop asking for random shit. And if you do ask for random shit, do not get irate an loud when we do no produce said random shit at your behest.
I suspect it's commonplace for people to storm into a McDonalds and demand a filet mignon, shrimp scampi, potatoes au gratin, and a glass of merlot.