This has been around for a long time, but I just encountered it recently. I'm reading through Wiseman's Quirkology, and was discussing real versus fake smiles with my colleagues (they had a hit-rate of 60% on the photos in the book, by the way—slightly better than chance). One mentioned Dave Barry's Emoticons: Using Internet "Shorthand", which broke the awesomeness-threshold required for me to post it.
:-D Person laughing :-D* Person laughing so hard that he or she does not notice that a 5-legged spider is hanging from his or her lip ... ;-) Person winking .-) Person who can still smile despite losing an eyeball
Tip of the ASCII code to Glen Douglas.