My top 3 are...
1) UFO/Government cover-up/Area 51/Roswell
2) Hidden Satanic/NWO symbols on money
3) The Boy-scouts of America are part(or,a cover for) the World-wide Satanic Conspiracy and are responsible for the disapearance of most people and children.
For me it was the CAR accident that killed Princess Diana and Dodi,i beleive that Princess Diana who had been married to the future King of England which we all know was Prince Charles.
On that Princess Diana would have been the future Queen of England and Totally Protestant in Religion for short C-of-E,so Princess Diana then started courting (with speculation of being Pregnant to Dodi Fayed)Dodi who we all know was a Muslim,there was NO WAY that the Queen of England along with the government of the day mixed with the UK's secret service (maybe Queen Elizabeth new nothing who really knows)had to get Both Diana and Dodi out of the way for good.
So i think that all this was a Huge conspiracy very cleverly planned with the above mentioned authority's involvement MURDER was committed and made look like an accident.
Thats my Conspiracy theory.
[Edited by Mirraluka, 7/2/2012 2:03:06 AM]
That's my favorite.
Oh, and that Are 51 has been moved to Australia :P