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The line comes from Undertale, the 2015 role-playing game by Toby Fox, where Sans speaks it before his notoriously difficult boss fight on the game's Genocide Route. Because that fight became famous for its difficulty and for Sans breaking the game's usual rules, the warning quickly spread beyond the game as a meme. Clips and edits reused it whenever someone was about to face an impossible challenge, and it remains popular because it works even for viewers who have never played Undertale, as a short, ominous threat before a disaster.
About this sound
Sans asks if you want a bad time in this short Undertale voice clip, used by creators online before a tough boss fight, prank, or dramatic reveal.
The clip is a single short spoken line from Sans, the laid-back skeleton from Undertale, delivered in a calm, low and deliberately threatening tone that makes the warning feel more dangerous than a shout would. It lasts only a couple of seconds, with a brief pause that lets the threat land before the action starts. For viewers who know the game, it instantly recalls the hardest boss fight in Undertale and the feeling of being completely outmatched. For everyone else, the slow delivery and ominous wording still work as a clear signal that something bad is about to happen.
