A professor teaching medicine at the university was tutoring a class on 'Observation'. He took out a jar of yellow-colored liquid. "This," he explained, "is urine. To be a doctor, you have to be observant to color, smell, sight, and taste."
After saying this, he dipped his finger into the jar and put it into his mouth. His class watched on in amazement, most, in disgust. But being the good students that they were, the jar was passed, and one by one, they dipped one finger into......
