Anyway, I went back to the tire warehouse during lunch break today.
Tire Warehouse Guy #1: Hi, what can we do for you today?
Me: I need a lug nut. I've currently only got three on the tire I got here yesterday.
[Tire Warehouse Guy #1's cordless phone rings. He answers it and wanders outside. There is a short delay. One of the other tire warehouse guys finishes dealing with another customer and turns to me.]
Tire Warehouse Guy #2: Hi, how can I help you?
Me: I'm down a lug nut on one of my tires.
Tire Warehouse Guy #2: OK, just a sec.
[He disappears into another room, from which Tire Warehouse Guy #3 emerges after a short while.]
Tire Warehouse guy #3: What do you need?
Me: [getting a bit frustrated] Lug! Nut!
He determined the size of the lug nut and disappeared behind the 'authorized personnel only' door, only to reemerge shortly with bad news: they didn't have a matching lug nut in my size. However, they did have chrome lug nuts in the correct size if I didn't mind that my lug nuts didn't match.
I indicated that I didn't care, and voila!
Pretty stylin', eh? They did all of this for free, which I appreciated. So the story has a happy ending.