* Creator/JRRTolkien's Balrog, and whether its wings are literal or metaphorical.
** Also, whether Legolas had blond or brown hair.
** Also, whether Tolkien's elves have pointed ears or not.
* Pick an event in a ''Literature/HarryPotter'' book. Any event, major, minor, irrelevant, plot-related, character-related...''any'' event, in ''any'' Harry Potter book. It is guaranteed that someone, somewhere, at some point in time, has had a flamewar over something about that event.
** One of the most notable events: the [[WhereAreTheyNowEpilogue epilogue]]. It divided the fanbase in two; [[http://curbsideprophecies.wordpress.com/2007/07/28/harry-potter-and-the-epilogue-of-controversy/ this post]], for example, gives logical reasons why the epilogue had some significance but overall was not happy with it; and some people were unhappy because they wanted to decide for themselves what happened after the death of Voldemort, and felt that the epilogue felt like bad [[FanFic fanfiction]].
** More fuel between shippers will be unleashed [[http://newsfeed.time.com/2014/02/02/j-k-rowling-says-hermione-should-have-ended-up-with-harry-potter-not-ron/ with Rowling's admission Ron and Hermione shouldn't have ended up together]].
* Discussion on any ExpandedUniverse. On the official DungeonsAndDragons forums, discussing any of the novels is an offense punishable by an instant ban, because of what appears to have been one of the worst flame wars in recorded history. The admins and mods did a [[OrwellianEditor VERY thorough job]] of making sure that the posts comprising the Flame War got deleted, and if a mod even hints at the cause of it, they are fired immediately.
* Creator/WilliamShakespeare: greatest playwright of the Reformation, or complete fraud? And if Dear William didn't write his works, then who did -- [[FrancisBacon the guy who died of chills contracted while stuffing chickens with snow]]? [[Creator/ChristopherMarlowe The secret agent of the crown killed in a bar fight]]? (incidentally, this makes this trope OlderThanSteam, as the discussion has been going on for some time now)
* ''Literature/{{Twilight}}'' fanatics vs. haters.
** Also, ''Twilight'' vs. ''Literature/HarryPotter''.
** In-fandom, you've got [[ShipToShipCombat Team Edward vs. Team Jacob.]]
* Please, never ask anyone what their favorite ''Literature/WarriorCats'' character is, or it will lapse into a never ending debate of Jayfeather vs. Hawkfrost vs. Franchise/HarryPotter.
** Go on the [[Website/WarriorsOfficialForum official forum]] and mention that Cinderheart is the best character ever and not a MarySue, or say she is a horrible MarySue. Alternately, mention Lionblaze's mate. Hey, they burned down my house!
* Creator/HenrikWergeland and rival ''Johan Sebastian Welhaven'' managed to start a FlameWar with a ''clipboard'' and ''handwritten insults'' in the 1830s - it got so intense the whole university joined in, chose sides, and when the thing eventually got into the newspapers, it escalated UpToEleven. As tropes go, the flame war was exaggerated by literates, to last for another ''150 years'', if not even longer.
** Even more awesome when considering the two of them wrote out the entire thing in competing ''four line verses''!