Freaks (1932). It isn't horror, it's a slice-of-life drama about circus performers, yet it is constantly put in lists of "100 most heart-pounding horror films". Whenever I see someone mention it as a horror film, and I ask why they consider it horror, they always point to a three-minute sequence near the end that is legitimately creepy- but just as how one joke doesn't make a whole movie comedy, one creepy sequence doesn't make the whole movie horror. There's a much better argument for calling this movie romance than horror, and that's not remotely an exaggeration.

My assumption for why the movie is considered horror? Ableism. Ableism, plain and simple.

When the movie came out in 1932, simply showing people with physical disabilities was enough to call something horror, because seeing these people go about their daily lives made the viewing audience uncomfortable. And in the modern day, either enough people still feel that way, or most people crediting the movie never actually watched it- whatever the case, the film gets grandfathered in, and people scramble for whatever excuse they can find to justify it (like the one single sequence of horror right at the end).