In most cases, urban legends are just that: stories spoken over the water cooler.
However, reality often proves more potent than people's imaginations.
Frightening genuine occurrences may inspire stories that enter the collective unconscious and become part of popular culture.
This is an age-old story.
We've all heard the horror tales about the murderer who lives in the attic and only comes out at night.
However, this has in fact occurred.