Since the recognition of just how subject the mind is to bias is the foundation of skepticism and science, educating people about bias seems to be a good way to get them to appreciate the importance - nay, the necessity - of the scientific method. Although visual illusions are well known (putting in doubt the old saw that "seeing is believing"), it is less widely known that our auditory system is also subject to error and illusion. Now, as part of a special feature on music, New Scientist magazine has put together a useful list of their top 5 auditory illusions. If you don't know about this topic, I highly recommend you listen to all five illusions - and then come to terms with the fact that what you hear isn't always a good mirror on nature.
Maybe if the ease with which our ears can be fooled became more widely known people would be less likely to fall for such nonsense as electronic voice phenomena and other auditory pareidolia.
(Hat tip: Mind Hacks. See also: Michael Shermer's skeptical TEDTalk that features his analysis of purported Satanic lyrics in a Led Zepplin song.)