Riverdale's 'Mass Seizure' Scene A Rising Reaction Meme On Stan Twitter

There Was a Mass Seizure at School refers to a promo for Riverdale season three, episode eight featuring a scene where numerous people at Riverdale High School suffer from a mass seizure after drinking water tainted by drugs, the narration voiceover saying, "There was a mass seizure at school." The promo was released in December 2018 and became the subject of memes throughout the 2020s, including as a reaction video.