A man walks into a Doctors office and puts a note on the table
in front of the Doctor. The note says: "I can't talk, help
me!"
The Doctor thinks for a while and says to the man, "Put your penis
on the table here."
The man thinks this is a bit weird but does as he says.
The Doctor takes a rubber mallet and hits his penis with it as hard
as he can. The man cries in great agony:
"AAAAAAAAAAAAAAAAAAAAA....." and the Doctor says, "Good, come again
tomorrow and we'll learn B!