Heh...I actually work as a manager for a Subway. I should use this time to post all the crap some customers do that annoys me.
-GET OFF YOUR CELL PHONE
-Don't ask for white cheese. At our Subway, we have three cheeses that are white: Provolone, Swiss, and American. Note that there's absolutely nothing special about White American cheese. Its the same crap American cheese you buy at the store, its just not colored to look like cheddar.
-Don't ask for "9 grain" bread. We have wheat and honey oat (Note that its just "Honey Oat", not "Honey AND Oat"), and both are 9-grain.
-Don't ask for a ______ and cheese sandwich, (Ie, "Turkey and Cheese" or "Ham and Cheese"). All of our sandwiches come with cheese. You don't need to tell me you want cheese on it. HOWEVER, if you're telling me the exact KIND of cheese, then that's fine, and is actually preferred because then it means one less question I have to ask you. So asking for a "Turkey and Cheddar" is fine.
-Asking for your sandwich to be cut in half is not the same as asking me to wrap each half separately. We ALWAYS cut the foot longs in half. If you want each half wrapped separately, say so. I'm not going to assume that that's what you wanted just because you asked me to cut it in half.
-Don't tell me you want a $5 footlong. It doesn't help me make your sandwich. All our footlongs are $5, asking for a $5 footlong doesn't narrow it. You wouldn't go to McDonald's and say "Can I get a value meal?" would you? Of course not!
-Those are red onions, not purple onions. Yes, I know they look purple, but they're still called red onions because the skin on the outside is reddish. Go to a grocery store produce section and ask the guy there for purple onions and he'll probably look at you funny.
-My speed depends on YOUR speed. Don't wait for me to finish putting a veggie on and I look up at you to tell me the next veggie you want. Each second I have to wait for you is another second I could be spending helping the next customer.
-"Would you like any chips, drinks, or cookies with that today?" "No thanks, I'll just get a bag of chips." Self-explanatory.
I'm sure I'll think of more later.