Now days the smilie puts the the writers intentions in more complete order.
http://research.microsoft.com/en-us/um/ ... miley.html

Quote:
17-Sep-82 10:58 Neil Swartz at CMU-750R Elevator posts
Apparently there has been some confusion about elevators and such. After
talking to Rudy, I have discovered that there is no mercury spill in any of
the Wean hall elevators. Many people seem to have taken the notice about
the physics department seriously.
Maybe we should adopt a convention of putting a star (*) in the subject
field of any notice which is to be taken as a joke.