I worked at a fast food joint for a little over a year. Your job description really isnt clarified much when you hired. My work varied from:
Pushing peoples non-running cars out of the drive thru
Replacing someones tire with a spare
Cleaning the always gross bathrooms
Fishing various things out of the frier
Becoming burnt by grease splashes by dumbasses working at the frier
Having to work with, and communicate with complete idiots
Getting drunk at the annual christmas party
Having the manager slip a little alcohol in your drink every once in a while
Eating fast food twice a day, most days, and not getting fat, sick, unhealthy, developing a strange illness, or having chemotherapy from a crippling cancer.
You get a lot of variety of people around. From the people you work with (which are probably dumbasses, ex-cons, or some other type of shady person), to people though the drive thru (which range from the strangest family ive seen, really crappy cars, to the extremely rare hot chick)
Why do I call my co-workers dumb(im not leaving myself out, im as dumb as the rest of them)? We all took shitty jobs that started around $.25 above minimum wage. We were either too lazy, had a bad background, or were to stupid to realize there were better jobs.
You also meet some real losers. My manager who aspired, it seemed, from the age of 15 to be the manager of this shitty place. An ex-con who, at the age of 55, is back working for $9 and hour.
Fast food sucks. Next time you go through the drive thru, give the person working it a tip, or at least say something encouraging. If they give you a weird look or just go "Okaayy" well, its probably because everyone else treats them like dirt.