"Class on Observation" joke

A lecturer teaching medicine was tutoring a class on 'Observation'. He took out a jar of yellow-colored liquid.
"This", he explained to the class, "is urine. In order to be a doctor, you must 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 around and, one by one, they dipped one finger into the jar jar and then put it into their mouth.
After the last student was done, the lecturer shook his head. "Had any of you been observant, you would have noticed that I put my second finger into the jar and my third finger into my mouth."

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