It's one of my fav Dilbert cartoons but I can't find it.
'We'll have a meeting next week'
Girl: 'I might not be on good form, my erm friend is coming to visit'
Dilbert: 'I thought your friend coming would put you in a good mood?????????????'
Girl punches Dilbert in the face.
"Others expanded the term to include the practice of playing a seriously misinformed or deluded user, even in newsgroups where one was not a regular; these were often attempts at humor rather than provocation. In such contexts, the noun troll usually referred to an act of trolling, rather than to the author."