Ever masturbated and instead of *** got blood instead?

When I was about 14 during summer vacation I was doing what most boys do, jacking it every time it would let me. Well one day the parents were working and I was doing my daily ritual and after doing the business when I came, I came all blood. I looked down and freaked but never told anybody. I didn't jack it for like weeks in shear fear but it has never happened again since. Its been about a decade. Just wondering if anybody else has ever had this happen???