The :-) was invented on September 19, 1982 at 11:44 am - read story here...
 

On September 19, 1982 at 11:44 the :-) smilie was invented by Scott Fahlman in a discussion about how to make clear that something written was meant to be a joke

20 years later the thread was recovered from an old backup tape

read it here: http://www.cs.cmu.edu/~sef/Orig-Smiley.htm

:-)