Spray paint cans have contained a loose mixing ball since the mid twentieth century, so the rattle has become the universal sound of preparing paint. Online, the isolated shake was separated from workshop footage and reused as a standalone effect in edits, memes and soundboards. Its appeal is timing: a few seconds of shaking tells viewers exactly what tool is in hand without showing it. That shorthand keeps it popular for graffiti, custom sneakers, model making and room makeover videos where the prep matters.