Dum's hands clinched and unclinched. Her eyes were closed and her lips moving. I had not lived with the Tucker Twins for several weeks without finding out what that meant. When Dum did that way, it meant she was trying to control her temper. Her lips formed these words: "Oh, God, make me good! Don't let me biff Mabel Binks! Don't let me biff Mabel Binks!"