This clip comes from SpongeBob SquarePants, the long-running Nickelodeon animated series known for its exaggerated voices and expressive reactions. SpongeBob's incredulous delivery made the line easy to lift from the show and reuse out of context, and it spread through short-form videos, memes and soundboards where creators needed a fast way to show disbelief. Because the reaction is instantly recognisable and works without any setup, it remains a popular choice for comedy edits, reaction videos and group-chat replies.