Flashes and other super-speedsters also have the ability to speak to one another at a highly accelerated rate. This is often done to have private conversations in front of non-fast people (as when Flash speaks to Superman about his ability to serve both the Titans and the JLA in "The Titans" #2). Speed-talking is also sometimes used for comedic effect where Flash becomes so excited that he begins talking faster and faster until his words become a jumble of noise. He also has the ability to change the vibration of his vocal cords making it so he can change how his voice sounds to others.