The clip comes from Foster's Home for Imaginary Friends, the Cartoon Network animated series that premiered in 2004 and followed Mac and his imaginary friend Bloo at a home for abandoned imaginary friends. Short excerpts from the show spread widely online as reaction sounds, and this repeated line about the heat became a standalone shorthand for being uncomfortably warm. It stays popular because the exaggerated panic fits summer posts, travel clips and everyday complaints that need a cartoon exaggeration rather than a serious response.