There are subjectives, and then there are these. While you may believe a work fits here, and you might be right, people tend to have rather vocal, differing opinions about this subject. Please keep these off of the work's page.
Theater is a hard art form to pull off. If done well, it comes off as enjoyable and masterfully done. Then there's the examples which calling them high school worthy would be an insult to high school productions, especially seeing as some high school productions are fantastic.
A production can still be running, but that doesn't mean it doesn't belong here. As long as they draw universal hatred from critics and audiences alike, they belong here.
Merely being offensive in its subject matter or a flop is not sufficient. Hard as it is to imagine at times, there is a market for all types of deviancy, no matter how small a niche it is. It has to fail to appeal even to that niche to qualify as this. (If you're unsure whether it belongs here or not, visit the discussion page and give us your input.)
It isn't horrible because a caustic critic panned it. There has to be legit reason for it being too awful to even exist.
Examples (more-or-less in alphabetical order):
Bill & Ted's Halloween Adventure is part of Universal Studios' Halloween Horror Nights theme event. The play typically features Bill and Ted going on some comic adventure that's ostensibly in line with either Halloween or the Universal stable; for the 2013 production at the Hollywood park, this was Bill and Ted being whisked away to Oz.note For what it's worth, the Orlando show wasn't nearly as Horrible, owing to different creative teams at the two parks; maybe Hollywood should take cues from Orlando in 2014. (It was themed around the Evil Dead remake and a Brainwashed and CrazyTaylor Swift creating a Deadite army out of teen pop stars.) It was also outstandingly horrible. The humor involved would be one level of it, as most of it is made up of tired pop-culture references the likes of which might make Seltzer and Friedberg feel some modicum of shame.
The original 1988 production of Carrie: The Musical, based on Stephen King's breakout hit novel and its 1976 film adaptation, was at the time one of the most expensive productions in Broadway history, costing over $8 million. That money clearly didn't buy quality, as it was met with boos on opening night and scathing reviews. As explained in this article, it was a mess of bad music, garish costume choices, Special Effect Failure, and Carrie's powers being given barely any explanation. It closed after only sixteen previews and five performances, making it among the most notorious flops in Broadway history. It was bad enough that it was seen for years as the benchmark for a truly Horrible musical; a book written in 1992 about Broadway disasters was titled Not Since Carrie.
There has since been an off-Broadway revival of the show that was heavily retooled, with many songs being replaced and rewritten; this version is substantially improved over the original, and a far cry from its Horrible status.
Acclaimed company Cirque du Soleil are known for their usually well-reviewed productions, but when they stray too far from their comfort zone...
In the wake of their success with their seasonal production Wintuk in New York City, they made a stab at an off-Broadway resident show. The result was Banana Shpeel, a production so bad it didn't even appeal to die-hard fans of Cirque, or even Guy Laliberte himself. The show was a twist on vaudeville humour, and promised a mix of slapstick and acrobatics. Instead, the show consisted of an annoying Jerk Ass running around shouting nonsense, lame bathroom humour, stupid slapstick gags about being spat on or slapped, and maybe two Cirque-ish setpieces. The show flopped in its 2009 tryout run in Chicago and even after a substantial retool opened to condemnation from audiences and critics in New York. Hoping to spark interest, a tour was attempted, but it made it only to one stop in Canada before being shut down for good. With the initial version of Criss Angel Believe getting panned hardcore, ZAIA struggling to sell tickets in China, and OVO and Viva Elvis getting mixed receptions in North America, this further ran Cirque's reputation into the ground. Thankfully the company managed to make a comeback creatively with 2010's Totem, and even made a happy return to the Big Apple with Zarkana in 2011.
The current version of Criss Angel Believe. The first version was poorly received, but it has its fans. In 2010, he dropped the acrobatics and storyline, and reduced it to a lame-ass stand-up comedy show with one dance act and lame tricks that can be seen at an elementary school talent show — doves appear from his jacket and so forth. Worse, there's still a hideous amount of Special Effects Failure (wire harnesses visible, trapdoors obvious), and he often makes racist remarks and embarrasses people in the audience (but not in the traditional Cirque way, where the poor bastard still has fun regardless). It's baffling that it bears the Cirque namesake now; it only continues to run because of the 10-year contract Angel signed with the Luxor resort.
Joe Brooks' In My Life was a mercifully short lived broadway musical, and his last before the legal troubles hit him later in his life. The show concerned a man with Tourette's Syndrome and a brain tumor. Supporting characters included his bike-riding dead sister and a guardian angel, who was a transvestite. The show was rife with Unfortunate Implications and disgustingly corny boy-band ballads, painful dialogue and disgusting attempts to turn the subject matter into a happy-go-lucky matter (a sample lyric: "Here's a little rumour/Someone's got a tumor"). To make things worse, there were nonsensical amounts of Mind Screw, including a character who collects dolls made out of seashells and eats gummy bears for breakfast, and a finale featuring a giant lemon. Your head will explode trying to make sense of the thing. The show opened to critical and audience slamming, making it to the top spot of many "Worst Musicals of the year" list, and no one was sorry when it was closed down due to disastrous reception after a month.
One would think that a stage musical based off of Lord of the Rings would be a recipe for success, right? Not so, if the 2006 production was any indication. After being unable to find a suitable British theatre to mount the production, the producers (who had spent an estimated $27 million on elaborate effects, licensing fees and rotating sets) decided to stage a test run in Toronto, Canada. The reviews, however, were scathing. Despite being scored by the film's composer (Howard Shore) and featuring a cast of heavyweight dramatic actors, the musical was a plodding, confusing mess that haphazardly cut out large chunks of the source material (even though the musical was almost four hours long). The rest was filled with overwrought narration, hammy performances and ridiculous effects (the Balrog is represented by a large tissue-paper blow-up doll that is backed by wind blowing into the audience's faces). The producers promised Toronto's mayor that "The Nerds Would Come" - in the end, the show was panned by audiences as well as critics, closed down after five months (despite the producers promising the show would run much, much longer) and resulted in a financial loss for both the producers (who opened the show in London a year later, to the exact same result) and the city of Toronto.
Andrew Lloyd Webber's The Phantom of the Opera had quite a few mockbusters in the wake of its success, but a 1991 Florida production (which even used a similar poster design to the Webber production) was actually videotaped and made it to DVD at the Turn of the Millennium, preserving its painfully bad writing, predictably bad songs, and ridiculous ending.
Back in the 1800s, someone made a production called The Play Without An "A", the script being made without words with an "A" in them. The end result was really difficult to perform. Nowadays it might be considered So Bad, It's Good, but it was produced in France at a time when everyone was very high society and thought humor was impudent and disgraceful. The play only had one performance, because the audience was so disgusted by it they rioted and stopped the show. It hasn't seen the light of day since.
The first version of Spider-Man: Turn Off The Dark. The second version of the show opened to a lukewarm reception and fits on the other end of the spectrum. The original version suffered from severe bouts of Adaptation Displacement and Critical Research Failure, glacial pacing, craptacular music and terrifyingly wooden acting. It also had the most cringeworthy example of a Greek chorus which consisted of a group of teenagers (a "geek chorus") writing a comic book. Audiences routinely condemned it and it didn't fare much better with critics who chose not to wait for the constantly postponed official opening and instead reviewed it during this preview period. The majority of the previews had massive technical issues (one incident caught on video involved Spider Man's wire harness breaking and the performer falling a considerable height). Director Julie Taymor was fired and songwriters Bono & The Edge threatened to disown it unless it was retooled considerably. Which it was, and the result was much better received by audiences. Critics still hated it, but not as much, and the show has fans and continues to attract more people today.