Some guy I haven't spoken to in some time just phoned to warn about the upcoming "blackout" that will supposedly be affecting my area this Wednesday. He mentioned a FEMA drill, and that this sort of thing preceded the Boston Marathon incident and some other event that CTs commonly talk about (9/11? I can't remember what he said). I just let him talk, not wanting to offend him with incredulity. Any thoughts on the genesis of this claim?