A lecturer teaching medicine was tutoring a
class on 'Observation'. He took out a jar
of yellow-coloured liquid. "This", he
explained, "is urine. To be a doctor, you
have to be observant to colour, smell, sight,
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."