A lecturer teaching medicine 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 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."
