The phrase han ska vad is Swedish for he is going to do what, and its use as a meme comes from pairing ordinary confusion with an extreme sound effect. Online, the explosion mode version spread through short form edits and soundboards where creators reuse the same shocked setup for many different situations. The joke relies on escalation rather than context, so viewers understand it even without speaking Swedish. It remains popular for quick reaction posts, gaming clips and ironic edits where a small surprise deserves a massively disproportionate response.