While doing a vasectomy (birth control surgery), 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 check-up.
"How's your physical relation with wife?" 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 sharwama stand, I get a hard-on!"