"That's forty-five pounds and sixty pence. Do you have a Clubcard?" The checkout girl said. "No, I don't."
"Would you like a Clubcard?" "Not really, I'm a loyalty card rebel. I think they are responsible for most of the evil in the world today."
"Really?" "Sure, I wrote about it in my novel: Loyalty Cards and the Downfall of Western Civilisation."
"Sounds like a riveting read," she said, warming to my cause. "Do you want Cashback?" "Nah, don't believe in it."
"Evil?" she offered. "Absolutely, grab a copy of my new novel: Cashback: The Carbuncle on the Arse of Humanity."