A patient complained to his physician that his stomach had been bothering him.
The doctor asked, “What have you been eating?”
The patient replied, “That’s easy. I only eat pool balls.”
“Pool balls!” said the astonished doctor. “Maybe that’s the trouble. What kind do you eat?”
“All kinds,” said the patient, “Red ones for breakfast, yellow and orange ones for lunch, blue ones for afternoon snacks, and purple and black for dinner.”
“I see the problem,” said the doctor. “You haven’t been eating any greens!”