Free Food?

Took number one wife out for a meal today. We ended up at a place which does "two meals for the price of one" (I only go to the classiest joints). They implemented this rather cleverly by simply doubling the price of a single meal. And of course there were three of us.

I really should have ordered a fourth meal. I'm not sure if I would have been capable of eating it but it would have been worth a try. I thought about offering it to the person stood behind me in the queue, but this would have only complicated things. In the end we just had the three meals and left it at that. But next time I go there it will be in an even numbered party.....