Tails is Miles Prower, the two-tailed fox who debuted alongside Sonic in Sonic the Hedgehog 2 in 1992 and became known as the series' young inventor and mechanic. Short voice lines from Sonic games and cartoons are often clipped for reaction videos, which is how this brief didn't work line spread as a fail sound meme online. Its appeal is timing rather than context, so editors reuse it for broken inventions, failed experiments and gaming mishaps where a calm, disappointed response is funnier than a big dramatic reaction.