So this guy with three testicles goes to the doctor.
"Doc! I have a problem: I have three testicles!
The doctor thinks it over and says: "You have nothing to worry about. As a matter of fact you should be proud! How many guys can say they have three testicles?"
So the guy is relieved but when he leaves the doctor's office he has to go to the toilet. At the urinal he finds himself next to another guy and he proudly says: "You wanna know something? You and I together have 5 balls! What do you think about that?"
And the other guy says: "What, you only have one?"