Bad arguments, great illustrations – Boing Boing:
A specific form of the appeal to ignorance is the argument from personal incredulity, where a person’s inability to imagine something leads to a belief that the argument being presented is false. For example, “It is impossible to imagine that we actually landed a man on the moon, therefore it never happened.” Responses of this sort are sometimes wittingly countered with, “That’s why you’re not a physicist.”