Be wise Don't play with firecrackers
The pattern
This still is filed under Public health warning.
Define
A warning designed to change a health behavior (stop, screen, stay home), not to sell a brand.
Mechanism
Fear with a next step. The threat is specific. The action is doable today. Fear without an action is cruelty.
Verdict
The risk is real and the action is clear. Official or civic voices help.
Why it works
Three flat colours and no halftone is a production decision that becomes the style: every shape has to be a silhouette, so every shape reads at distance. The tilted stacked bars impose a strict reading order and add implied motion, which is how a static sheet gets urgency. The child's face is not drawn on top of the firecracker, it is cut out of it - threat and victim share one contour, so the consequence is stated by the drawing rather than by the copy. Scale does the fear appeal without showing an injury: the firecracker dwarfs the head, which is enough for a child to understand and mild enough for a health department to publish.
Steal this when
Steal this when a warning has to land in under a second on a passer-by and you cannot show the actual harm - make the hazard enormous, make the person small, and cut one out of the other. Also the right structure whenever a three-beat headline can be staggered to force reading order.