My in-laws, worried at the expense of being included in the family holiday to Florida, were pacified when I explained that because we were taking a "self-catering" holiday it wasn't nearly so expensive, and that they shouldn't worry about how much it was costing us.
Never having flown before, they were a little taken aback to be offered an in-flight meal during the 10-hour flight. After a short huddled conversation they declined the offer...........
"No thank-you, we're self-catering"

C-flat.