A doctor had his students in an anatomy class where they were dissecting a body.
The doctor said, “Rule 1: Dont be repulsed by anything in the human body”.
So he stuck his finger up the corpse’s ass, pulled his finger out & sucked it! He told the students 2 do the same.
After hesitating, they stuck their finger up and sucked it!
The doctor then said “Rule 2: Pay attention!! I used my middle finger & sucked my thumb”.