Certain names, numbers & events can conjure up the memory or association of evil things. Yet, numbers by them selves might not necessarily be evil or bad luck. Never the less, certain numbers & patterns can be linked to some terrible things throughout history.
http://desert-shapes.blogspot.ca/2013/08/616-and-666-911-and-999-etc.html
http://desertshapes.blogspot.ca/2014/01/mg-michael-bible-and-666-etc.html
