In fiction, road signs mean exactly what they say.
If the speed limit sign says 250, you had better be going 250. If a yellow caution sign warns of an impenetrable snarl of an intersection, a 360-degree vertical loop, or a moose, guess what you're about to see?
Further, any law-enforcement along the road will measure your performance according to the road signs (no matter how ludicrous, and even if they've been recently vandalized) and praise or punish you accordingly.
A character, whether due to mean or mischievous personality, educational purposes, or a traditional occasion such as Halloween or a camp out, has decided to scare someone with a story. And to make it extra scary, they make one or more details hit eerily close to home.
The most common approach is to make the character(s) in the story seem similar to the listener(s). Specifics such as hair colour, interests, number of people, job, etc will be the same as the listeners'. For added freakiness points, the storyteller might pretend to mull it over, then look directly at the listener (e.g. "There was a woman who had... I dunno... long, dark hair *looks directly at
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