A true email, from a friend who bravely swims upstream (edits mine to protect the friend):
Members of the Department of Impossibly High Standards,
Professor Extra-long BSD asked that the following message be sent to the Department:
"Dr. Extra-long BSD is on medical leave this semester because of high fatigue levels. His doctors are working hard to find the reasons for this condition."
Please join me in wishing Dr. Extra-long BSD a speedy and full recovery.
I think you have to turn in your secret decoder ring, the key to the executive men's room and they change the handshake if you claim "fatigue". Needless to say, Dr. E-lBSD is in his late 70s. Fatigue may just be the FSM's way of saying its time to stop stealing grad students from younger faculty.