Six Chicken McNuggets

Recently I went to McDonald's, I saw on there menu that you
could have an order of 6, 9, or 12 Chicken McNuggets. I asked
for half a dozen nuggets. "We don't have half a dozen nuggets,"
said the teenager at the counter. "You don't?" I replied. "We
only sell six, nine, or twelve," was the reply. "So I can't
order half a dozen nuggets, but I can order six?" "That's
right." So I shook my head and ordered six Chicken McNuggets.