Floating Sandbox is a physics sandbox game where players can place and trigger a wide range of objects and explosives, and the anti-matter bomb is one of its most destructive items. Its idle sound was originally heard only during gameplay, as players armed the device and waited for it to detonate. As clips from the game spread through short videos and soundboard collections, the low hum became a convenient shorthand for impending danger. Creators still reuse it because it signals that something powerful is about to happen without giving away the explosion itself.