5. Lizard People!
The Theory We've all probably heard this one before. The world is run by shape-shifting lizards. They infiltrate every one of the highest seats in government in every land, and pose as the entire British Royal family.
The Proof The Son of God swears it's true. No, not Jesus. Or even Brian. It's that OTHER son of God, the goalkeeper for Coventry City FC in the 1970's, David Icke. After a life-changing meeting with a spiritualist in the late 80's, Icke insisted that he had became aware that humanity as far back as Adam had been infiltrated by reptoids from the Fourth Dimension, who rule the world still, in a manner akin to the Aryan race. Icke has yet to share the facts behind his 'facts'.
The Truth Until Queen Elizabeth II and Barak Obama step out in public, smacking their maws and shedding laters of human skin to reveal shiny scales within, it's fair to say that Icke is a little way off on this one.