Henry Ford's fire door

We need to get a new fire door — the existing one's battered to buggery, what with one thing or another, and the Fire Safety Officer says it needs sorting.

"Can you order a new door," T.Aldous tells Seth. "A black one if you can."

"Fire doors are red," Seth points out. "If we're getting a new fire door it has to be red."

"Thinking about it, I think it should be green. Can you find out how much they cost, give Maisie the order and I'll get it passed through today."

"You can't have a green door. Fire doors have to be red."

"That's ridiculous. A green door would go better."

"Fire doors have to be red."

"Now you're being awkward."