Imagine that you’re a doctor treating a patient for back pain.
Imagine telling that patient that the cause of his back pain is a tumor.
Imagine performing surgery on the patient’s back to remove the tumor.
Imagine opening up the patient’s back, and seeing . . . . tiny human feet and hands.
Yup. A 35 year old truck driver in Russia was experiencing chronic back pain. The cause of the back pain turned out to be a fully developed (but obviously dead) "parasitic twin" that he never knew he had. Full story here.