Free Dinner (No Such Thing)

In which the Westport Woods Hotel offer me, Musters, a free dinner:

Would you like a free dinner?

How much is this free dinner?

It's free.

Free, Wow! But how much does it cost?

It's cost neutral.

Great, I'll take it.

Excellent. One more thing. If you want anything nice you have to pay a supplement.

Is it a free supplement? Like the Observer Music Magazine?

No, sir. It's a €12 supplement.

Then I'll take it! Thank-you!