Onion Balls

While doing a vasectomy, the doctor slipped and cut off one of the man's balls. To avoid a huge malpractice suit, he decides to replace the missing ball with an onion. Several weeks later, the patient returned for a checkup.

- How's your sex life? - the doctor asked.

- Pretty good - the man said, to the doctor's relief.

But then he added:

- I've had some strange side effects.

- What's that? - the doctor asked anxiously.

- Well, every time I piss, my eyes water. When my wife gives me a blow job, she gets heartburn. And every time I pass a hamburger stand, I get a hard-on!