There's certain topics everybody knows are going to start a fight - politics, religion, abortion, video game consoles - important things like that.
But there's a lot of topics not on the standard hot-button list that are guaranteed to stir a forum thread into a white-hot frenzy. Topics that you would think people could disagree on reasonably, like dog poop disposal or tipping, that somehow drive people to threaten physical violence.
The truth is stranger than fiction. Step into the world of weird news. Learn more