Nikola Milikic
I propose that the following character sequence for joke markers:    

:-)    

Read it sideways.    

– Scott Fahlman    
Smiley Layer Cake
Smiley Layer Cake, Milan Stankovic
(^_^) = :-)
Filip Radulovic
Smiley Ontology
University of Belgrade, Serbia
Filip Radulovic
Nikola Milikic
www.smileyontlogy.com
www.goodoldai.org
Smiley wiki:
(*_*)
:-*
:-O
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix so: <http://www.smileyontology.com/ns#>.
@prefix foaf: <http://xmlns.com/foaf/0.1/>.

<http://www.gmail.com/smiley122> rdf:type so:Emoticon;
so:representedBy :smileyVisualRepresentation;
so:representedBy :smileyCharacterRepresentation;
so:hasFraction so:happyFace;
so:hasFraction :Fraction2;
so:representsEmotion :Emotion.

:smileyVisualRepresentation rdf:type so:Picture;
so:isAnimated false;
so:belongsToSystem so:gMailEmoticomSystem;
foaf:img <http://gmail.com/smiley122.gif>.

:smileyCharacterRepresentation rdf:type so:CharacterRepresentation;
so:isAnimated false;
so:characters "B-)";
so:characters "B)".

:Fraction2 rdf:type so:Object;
so:representsObject <http://umbel.org/umbel/sc/Sunglasses>.

so:happyFace so:wearing :Fraction2.

:Emotion rdf:type so:Emotion.