Common Sense + Working at McDonalds= Happy Customers

Ok, so I have something to say this morning...
Common Sense+Working at McDonalds=Happy Customers.
So this morning, me and my wife were actually ahead of schedule and decided to stop by McDonalds to get some breakfast. Well, the drive through line was extremely long @ 7:45 am, as expected b/c 9 times out of 10, people are in a hurry or just too lazy to get out of their car and go inside and order what they want (present company included, so I'm not judging, just saying...)
So we went inside and there was NO ONE in line, not a soul. We went to order our food and to our dismay, this girl couldn't understand what in the world we wanted. Now before I go on with this story, let me preface it by admitting a few things.
1. We don't eat everything and we usually change up how our food is. Granted
2. We know that this is not Burger King and their motto is not "Have it your way" but they do usually oblige with a small substitution fee and we are aware of this.
3. These are young cats that may or may not always had the full life experience of "change"

So, continuing on with this story. My wife proceeds to order a Sausage biscuit combo, no egg, and instead of a sausage patty, a piece of Canadian bacon, with cheese.
The lady taking the order does not understand the order and asks us why don't we get the egg McMuffin instead. We wanted the BISCUIT!!!
Ok, so she proceeds to tell us that she's never heard an order like that...

Part II - The lady proceeds to input kesha's order separately, so that it'll make sure that all of the items ordered are given to her. Weird, but ok, whatever... When all is said and done, the bill came up to $11.19 - Um, my combo costs $3.49 + tax. Her meal should have cost $3.49+substitution fee+cheese+tax. We're looking at a bill no more than $10... But after some correction, re-addition of the items, separately, and realizing that this doesn't make any sense to anyone, the bill came to $9.28.

Part III - This is the part that really got us. We got our food and left out. Now let me tell you, when we left, there was a line of about 4 other people waiting and an additional register had to be opened to serve the customers. So we're in the car, headed to her job when my wife opens her food so that she can eat before she gets there and as she opens up, all her food is there, but she was served:
A biscuit
A piece of Canadian bacon
A piece of cheese.
All separately and she needed to put her sandwich together.

Now tell me, who was the one without the common sense in this case?
The idiot who rang up this order?
The dumbass who put the order together (figuratively, not literally)
Or us for going to this McDonalds in the first place...