Define
The first line is a warning, a refusal, or a negated claim. Something the reader cannot skim as praise.
Mechanism
Pattern interrupt. A negative is harder to slide past than a compliment. The payload must arrive immediately after the stop.
Verdict
The category is full of sunny claims and we have a real caution, contrast, or prohibition.
Don't
The product needs warmth first, or the negative is a hook with no payload. Clickbait is not this pattern.
Copy skeleton
Do not [COMMON MISTAKE] until you [SAFER CONDITION]. [1 or 2 lines on the cost of the mistake] [THE FIX: what to do instead] [ASK]
Gulf note
A warning lands in the Gulf when the cost is specific and the next step is doable today. A scare with no door is cruelty, not this pattern.
Rights-cleared examples
A careless word - A needless sinking" poster
Guard the Supply Lines" poster
Less dangerous than careless talk" poster
...Because Somebody Talked!" poster
A careless word-A needless loss" poster
A careless work - Another cross" poster
A wise old owl sat in an oak - The more he saw the less he spoke - The less he spoke the more he heard - Productioneer, be like that bird" poster
American's suffer when careless talk kills" poster
And bless those back home who, knowing of our sailing, kept that knowledge to themselves" poster
Are you a mosquito breeder?" poster
Award for careless talk" poster
Careless Talk Got There First" poster