The tungsten cube became an internet joke because tungsten is extremely dense and heavy for its size, so a small cube is treated in memes as impossibly solid and unstoppable. Editors later paired that idea with oversized explosion audio to push the joke further, imagining the cube sitting unchanged inside a nuclear blast. The pairing spread through short meme edits and soundboards where the boom alone signals total destruction, while the caption or image supplies the survivor. It stays popular for power scaling, durability jokes and absurd what would survive posts.