The title warns you off a command without naming it, so you have to click to check you are safe. The skull and stop sign make the danger feel real while the command stays hidden, and the fear of having already run it does the pulling.
How the packaging works
Title
The title names the threat and blames a source viewers trust too much.
Thumbnail
The thumbnail shows danger signs on the screen while the creator physically pushes you back.
Remix this
Use this when a common mistake in your niche can genuinely hurt people. Name the threat and where it spreads, but hide the specific thing itself, because the warning only carries weight if the danger is real.
The transferable lesson
Withhold the dangerous thing itself, sell the warning