lost_mysteries_ on Instagram: "You weren't supposed to see this one. In 2002, Blue's Clues aired an episode it was called "Blue's Missing Day." It only aired once. The episode begins like any other paw prints on objects, Steve greeting the viewers. But something's off.143 children were reported unresponsive. Silent. Blank. As if something had been taken from them. Parents described them staring into corners, whispering things like, "She showed me where I go when I'm lost." The network pulled it.