On a visit to the library I happened to notice a man and a woman, both deaf, signing with intense gestures, apparently in a heated debate. ©OFFICEJOKES.NET
The man said something, and the woman seemed upset. She started signing her reply very fast, to the point where the man couldn't understand a word; she also signed in big, wide gestures, which is the equivalent of volume. ©OFFICEJOKES.NET
Finally, looking strained, her companion took her hands, "silencing" her. The he signed, very small and slowly, "You don't have to shout, I'm not blind."