"People who work drive through tend to be careless about delivering orders."

No kidding, a careless 15 or 16 year old kid? How can you have gone through life without knowing that the drive thru is manned by young kids trying to get your food to you as quickly as possible? How do you not know that you need to check your bag, which takes all of 10 seconds?
Why does McD's care that you played softball until your stomach was aching and you were physically exhausted?
Know what I did the last time McD's forgot my fries? I just let it go and I didn't stavre to death or pine away for my 79 cents lost.
Let it go, it is not a big deal and McD's drive thru will always have apathetic kids working it so try to live in the real world already.