It's where they shunt off the poor schmucks who placed an order at the drive thru window and had the order messed up. I bet that parking space gets a lot of use.
To throw them into a real panic, try this sometime. Refuse to park. Tell them you're waiting for your order at the drive thru window until its ready. Then see how fast they get it out to you once the manager has figured out you really mean it. :O And they will call in the manager, not that it makes any difference.
I actually did this at one McD's that was always so slow it took them 10 minutes just to fill a small coffee.
Phil