Oh yeah, I tested positive there before. Here's an amusing case from the annals of Psychology:

"A 74 year-old deaf woman was admitted to a hospital because she was said to be acutely disturbed. She had left the water taps on in her house and had broken all of her crockery and said that she was tormented by voices. All of her routine physical signs were normal and her symptoms subsided after treatment with trifluoroperazine, but she complained of insistent voices emanating from her vagina in the form of songs singing the "Old Rugged Cross" and the "Hallelujah Chorus". At times she would sing along with the voices. After about 6 years of treatment, she began to complain about vaginal pain. Doctors examinations proved that there was nothing physiologicaly wrong with her and was diagnosed as psychogenic pain (that is pain without a physiological basis)."

Ahh, the Old Rugged Cross, can't say I've had that one yet. Here is an link to a list of psychological anomalies (the whole site is kind of fun to explore), interesting to see how many of these I've actually experienced. Perhaps I'm not as sane as I thought:

www.science-frontiers.com/cat-psyc.htm