Dodge or AFK
I entered a ranked game with three other buddies, and as soon as we got in the lobby, the fourth player instantly says "someone dodge or i'll afk." We proceed through the pick and ban phase while this player is continuing to tell one of us to dodge, saying it is his revolution for the poor League of Legends community... so ultimately I decide playing the game isn't worth the risk and dodge the game, as my 3 lp loss is nothing in comparison to the overall 80lp my friends and I would have lost together for losing a ranked 4v5...
Obviously this wasn't something I want to do - as future occurances like this or my computer/wifi having issues and making me accidentally dodge a game will result in larger punishments. There is also no way to report a player like this because there is no post game screen in which to do so. What am i supposed to do???