"Good-bye," the robot said. "And thank you."
"For what?" Martin demanded.
"For your cooperation," the robot said.
"I won't cooperate," Martin told him flatly. "It's no use. Whatever fool treatment it is you're selling, I'm not going to—"
"Oh, you've already had the ecology treatment," ENIAC replied blandly. "I'll be back tonight to renew the charge. It lasts only twelve hours."
"What!"
ENIAC moved his forefingers outward from the corners of his mouth, sketching a polite smile. Then he stepped through the door and closed it behind him.
Martin made a faint squealing sound, like a stuck but gagged pig.
Something was happening inside his head.