* In the ''Theatre/{{Wicked}}'' fandom, there's [[{{Canon}} Fiyeraba]] vs. [[WordOfGay Gelphie]]. It can get... heated. The Gelphie fandom seems to be the largest, though, probably because of the quite big number of gay people in the musical theatre fandoms.
* A common misconception about the ''Theatre/LesMiserables'' fandom is that serious ShipToShipCombat exists between shippers of Marius/Cosette and Marius/Eponine. In reality, particularly in modern day, fans tend to leave Marius/Cosette alone and ship Eponine with [[ShipsThatPassInTheNight Enjolras]], [[TheSmartGuy Combeferre]], or [[AllGirlsWantBadBoys Montparnasse]].
* Can get quite nasty among ''Theatre/ThePhantomOfTheOpera'' fans, with endless arguments over whether Christine should have ended up with brooding StalkerWithACrush the Phantom or NiceGuy Raoul.