Observation

A lecturer teaching medicine was giving a class on observation. He

took out a jar of yellow liquid.

"This," he explained, "is urine. To be a doctor, you have to be

observant of color, smell, sight, and taste."

After saying so, he dipped his finger into the jar and put it into his

mouth. His class watched in amazement, most in disgust. But being the

good students that they were, the jar was passed, and one by one, they

dipped their finger into the jar and put it into their mouths.

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 second

finger into the jar and my third finger into my mouth."