Puns. Apocalypse. One day. One drama.
Coincidence? I don't think so.
(I think Jeff Miller, king of Catholic punning, has to figure into this somehow.)
On a related note, there is now a facebook event called "Post-Rapture Looting". So far over 150,000 people plan to attend.
On a serious note, I can only wish the Second Coming would occur May 21st (remember: Christ coming is GOOD), but someone--oh right, Jesus--said we would not know the day or the hour, so I'm not sure where this apocalyptic group is getting their information from.