Recently, when I went to McDonald's I saw on the menu that you could have an order of 6, 9 or 12 Chicken McNuggets. I asked for a half dozen nuggets.

"We don't have half dozen nuggets," said the teenager at the counter.

"You don't?" I replied.

"We only have six, nine, or twelve," was the reply.

"So I can't order a half-dozen nuggets, but I can order six?"

"That's right."

So I shook my head and ordered six McNuggets.