* GameBreakingBug: The Assist Tick bug, which will crash Stempania if you have the assist tick on in the editor and you stop testing a chart. Happens randomly too, and only in the mode people would use the assist tick.
* GoodBadBug: [[http://www.stepmania.com/forums/showthread.php?t=24289 Negative BPMs and Negative Stops.]]
** Ironically, the only reason it was patched out was because it messes with scoring. The update immediately after the above [[http://www.stepmania.com/forums/showthread.php?t=24305 adds a much easier to use variant]] that also plays nice with the scoring system.
** This causes lots and lots of {{Suddenly Harmful Harmless Object}}. A wall of arrows or a set of holds might turn out to be mines - or alternatively, the mines you try to avoid turn out to be arrows, causing you to miss them. {{Trial And Error Gameplay}} follows.
** This has since become an AscendedGlitch with support for Warps in [=StepMania=] 5.
* MemeticMutation: Anything from the Bemani community partially overlaps into Stepmania communities.
** An True Hero
** [[{{Mondegreen}} You need a]] [[http://www.youtube.com/watch?v=-0bDg8oCTJE lawn!]]
** [[http://www.youtube.com/watch?v=uJPysAmX9zg TAKAKU! TAKAKU! TAKAKU!]]
** Subjectivemanias
** [[http://www.youtube.com/watch?v=g6LoC9KUVtI MAD OF FIRE]]
* MostAnnoyingSound: This whole game to people who aren't fortunate enough to know what the music sounds like behind your headphones. Rhythmic keytapping has been known to drive some people insane.
* SeriousBusiness: Why the [[LampshadeHanging Xoon Total Drama]] packs exist. Also, the Mystery Packs bring out the worst in people.
%% Due to the user content-driven nature of the game, please think twice before adding examples of That One Level or Boss. If we listed every hard simfile this page would be longer than War and Peace.