The phrase something in the water has long been used in everyday speech to explain why a whole group is acting strangely, and the clip version condenses that idea into a single drop-in line. It spread through soundboards and short video edits where creators needed a quick way to flag suspicion without adding their own narration. Because the wording is familiar and the meaning is flexible, it still fits local jokes, fandom edits and reaction videos whenever several people share the same odd behaviour.