Listen to the sound clip Not so Fast! (Lang) from Not So Fast Soundboard: Not so Fast! (Lang) Not so Fast! (Lang) This sound is from Not So Fast Soundboard The first sound on the list is a commanding voice saying, "Not so fast Mojo Jojo." This sound is instantly recognizable to fans of the Powerpuff Girls, as Mojo Jojo is one of the show's most iconic villains. The voice is stern and authoritat… Go to the full soundboardwith more sound clips Search