Sir- don't waste while your wife saves. Adopt the doctrine of the clean plate- do your share" poster
The pattern
This still is filed under Civilian war-duty equate.
Define
A civilian act (saving, making, staying quiet) is framed as the same duty as the front.
Mechanism
Moral equate. The small act inherits the gravity of the large one. The ask is ordinary. The meaning is not.
Verdict
We need mass compliance on an unglamorous behavior and can honestly tie it to a shared stake.
Why it works
It uses gentle public shaming and humor. It specifically targets men dining in restaurants, pointing out the hypocrisy of women saving food at home while men waste it dining out. The phrase 'doctrine of the clean plate' gives a memorable name to the desired behavior.
Steal this when
You need to correct a specific hypocritical behavior in a subset of your audience without being overly aggressive, using slight caricature and a catchy doctrine.