Internet Troll

The internet troll.  Invader of message boards everywhere.  Wikipedia defines the internet troll as someone who posts controversial, inflammatory, irrelevant or off-topic messages in an online community, such as an online discussion forum or chat room, with the intention of provoking other users into an emotional response or to generally disrupt normal on-topic discussion.  When you see one it is your epic moral duty of awesomeness to call them out in order to let the thread die thereby disarming the troll (result you win).  Sometimes the best way to do that is to insert an image.  Here are some good ones that you can arm yourself with to battle the trolls.