What do vampires, terrorists and UPS have in common?

Reality bites. (Sub required)
It turns out, they are all urban myths that rage across countries in a matter of weeks and vanish! These legends or myths arise spontaneously and can rarely be attributed to a single source. Also, these myths have been in existence even before email, internet or telephones.

The million dollar question is: how do these myths spread? is there a generic process by which urban myths are created, disseminated and retired? Think about the business applications for such a process!