Strangers! (Sean Ellis /Photographer's Choice/Getty Images)

I’ve devoted several recent posts to the doppelgangers in your life and how best to defeat them. You know what I’m talking about: the unexplainable twin you keep running into on the train or that stranger who looks just like your mother but doesn’t know how to cook a pot roast.

This is no conspiracy, however. It’s all in that brain of yours.

So in this podcast Julie and I roundup some of the more amazing examples of delusional misidentification syndrome, including Capgras syndrome, syndrome of selective doubles, clonal pluralization of self, mirrored self-misidentification and third man syndrome.

You’ll come out the other end of this one with a renewed knowledge of just how delicate the balance between sanity and insanity really is.

So there you have it! As always, you can find the Stuff to Blow Your Mind podcast on iTunes, Zune and the RSS feed. And don’t forget the free HowStuffWorks iPhone App.

Skull still intact? Follow Robert and Julie for more mind-blowing science on Twitter and Facebook.