This sound is commonly shared online under labels like Monstres et Cie, the French title of Pixar's Monsters, Inc. from 2001. Short reaction snippets from well-known animated films often spread through reposts, soundboards and meme edits without much source detail, and this clip fits that pattern. Its staying power comes from how brief and readable it is: a single murmur can instantly signal doubt, scrutiny or mild disapproval in almost any edited scene.