Comedy scene.
Setting: I'm standing at the M&S cafe counter, ready to order.
Me "I'd like to order a cheese toastie, please."
Staff: "Excellent choice madam."
Me: "Oh, and a side of fries?" Staff push buttons but till sounds loud alarm.
Staff: "Sorry, the Excess-Carbohydrates alarm went off. I can't accept that order. But you know what, I'm pretty sure you could swap the fries for a hot chocolate. It's artificially sweetened so low carb after all"
Me: "Okaaaaaaaayyyyy...."
Staff: "Alternatively you could order the BigMark Burger with your fries. The fat and protein cancel out the carbohydrates, which is handy, so you can have fries after all."
Me: "Isn't the BigMark Burger like 1000 calories?"
Staff: "Well, yes... but " leans in to whisper "you don't have to eat it all."
Me: "It's good to know I have some choices here."