The sound comes from SpongeBob SquarePants, where dolphin chirps replace the characters' swearing in the episode in which SpongeBob and Patrick pick up bad language from a dumpster. Rather than using a standard television beep, the show used cheerful marine-animal noises that matched its underwater world, and the gag stuck. Clips of the censored lines circulated as memes and soundboard uploads, and editors began reusing the chirp as a general-purpose censor. It remains popular because it is instantly recognisable, family-friendly and funnier than a plain beep.