The scenarios postulated above are all equally scary...SO let me add my two cents.
1) An airborne version of Ebola or other epidemic
2) Asteroid Strike
3) Economic collapse
4) "Independance Day" visit from E.T.
5) "1984" government starting war
6) Mass religious/cultural hysteria caused by any of the above problems
7) A combination of factors from above
Now let's see who can sleep tonight!!
