Last October, looking for something seasonal to watch, I stumbled across a movie called Halloween Party (2012). It is an utterly terrible low-budget comedy. I can't summarize it because I can't sit through more than five minutes of it without fast forwarding, but I feel confident in declaring that nobody has ever enjoyed watching this movie, even ironically.
It has a high rating and pretty good (ie, shill) reviews on IMDB and Amazon. In fact, on Amazon, a lot of the rave reviews are from "verified purchases", so in theory they must have actually bought a copy of it. IMDB has a ton of links to "critic" reviews, but most of them are 404'd. It appears on a suspiciously high number of IMDB user-created lists. Most of the user descriptions make it sound like some kind of raunchy sex comedy or soft porn, which it is not (ie, they are clickbait). The Amazon "users also watched" algorithm mostly recommends a bunch of soft porn from the 1980s-90s, plus a couple of horror movies. Five writers are credited.
I figure there's got to be some kind of story behind this. It almost looks like they filmed it to game search algorithms or something and propped it up with bots. Whatever the deal is, I bet there's another million movies just like it, hanging around on Page 99 of any random Amazon Video search.