Peekaboo tiptoed towards the stray cat preening itself in the abandoned house. His older brother, Shriekaboo, rolled his eyes. "Why are you creeping?" he asked. "The cat can't hear you." "He's concentrating, Shriekaboo," Father said. "Don't you remember what it was like to be a ghost in training?" "Of course," Shriekaboo said. "I scared a snake right out of its skin with my very first boo." He patted his left pocket. He'd kept the snakeskin as a souvenir. "Yes, well, you have a natural talent," Mother said. "Others need practice."  Peekaboo tiptoed to a stop. "If the cat can't hear me, how am