A professor is giving the first year medical students their
first lecture on autopsies, and decides to give them a few
basics before starting. "You must be capable of two things
to do an autopsy. The first thing is that you must have no
sense of fear." At this point, the lecturer sticks his finger
into the dead man's anus, and then licks it.

He asks all the students to do the same thing with the corpses
in front of them. After a couple of minutes silence, they
follow suit.

"The second thing is that you must have an acute sense of
observation: I stuck my middle finger into the corpse's anus,
but I licked my index."

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