A lecturer teaching medicine was giving a class on 'Observation.' He took
out a jar of yellow-colored liquid. "This," he explained, "is urine. To be
a good 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
students that they were, the jar was passed, and one by one, they dipped
one finger into the jar and then put it into their mouth. After the last
student was done, the lecturer shook his head. "If any of you had been
observant, you would have noticed that I put my 2nd finger into the jar
and my 3rd finger into my mouth."
