Joke
(translated from german)
A professor of medicine is holding a lecture for his first year students to introduce them to medicine.
“We will start with the basics of Autopsy. Two things are very important.
First: You have to overcome disgust. Look here …”
And he puts a finger into the ass of a dead man on the table, pulls out the finger puts it in his mouth.
“And now you, one after the other!”
With white faces each of the students go past the body. Once they are done the professor continues.
“And second you need to sharpen your observation skills. I put the index finger in the man’s ass and put my middle finger in my mouth.”

