FIRST LECTURE ON AUTOPSIES

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.