A lecturer teaching medicine was tutoring a class on 'Observation'. He took out a jar of yellow-colored liquid. He explains "This is urine. To be a doctor, you have to be observant to color, smell, sight, and taste." After saying this, he quickly dipped his finger into the jar and put it into his mouth. His class watched on in amazement, most in disgust. However, being the good students that they were, the jar was passed and one by one, they each dipped one finger into the jar and then put it into their mouth. After the last student was done, the lecturer shook his head and says "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."
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