Why are people so impatient in fast food lines?

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I work in the fast food industry and nothing irritates me the most than having impatient customers. I understand that the term "fast food" means that the food should be delivered quickly. But, seriously--it takes time to prepare the food correctly and to have the order assembled correctly. The worst complaints are from Greyhound passengers who come into the resturant where I work (which is directly across the street form the Greyhound station) they place their order(s) and complain that if they don't get their food in a hurry, they will miss their bus. More often than not, the driver is standing next to them, placing his/her order. I tell them politely that there are a few orders ahead of theirs and it will be up in a few minutes. Sometimes, they are ok with that, and other times they throw a fit demanding their money back. As for the other patrons of the resturant, I can't figure that out. I try very hard to be polite with these people, but I'm finding that is becoming very difficult. Any thoughts??