Medical researchers in the UK recently dissected the body of a 78-year old man who had donated his remains for research. They were surprised at his genitalia: the man had three penises.
Diphallia, which is the state of having two penises, is rare. But, according to the researchers' article in The Journal of Medical Reports, there is only one other known case of triphallia in medical literature.
This gentleman had one primary and two secondary penises. The largest had a functional urethra which it shared with the medium-sized penis. The smallest of the three penises did not have a urethra at all. Each, however, had a corpora cavernosa and a glans penis.
-via Dave Barry | Screenshot from Inglourious Basterds