Lato-lato is a clacker toy with two balls attached to strings, known for its loud repeated knocking sound. The toy surged in online videos during the early 2020s, especially in short-form clips where the sound itself became the joke. Creators use it to represent noise, stress, childhood nostalgia, or a scene that will not calm down. Its staying power comes from how instantly recognizable the rhythm is and how easily it matches frantic edits, much like a vine boom sound in exaggerated meme pacing.