Get this. My bro in law had testicular cancer on his heart. Apparently your nuts, when in the embryonic stage, are developed next to the heart. A little piece of testicle (nut) was still with the heart and that little piece got testicular cancer.
Chemo and a strong will has allowed him to remain cancer free for 15 years now. Even had two kids though the doctors said the chemo would leave him unable to.