"I wish I didn't have to take Zoe and her friends to the mall," he said, forgetting that he was holding the stone.
When it glowed, he had an urge to close his eyes. And when he opened them, he panicked. What did that wish do?
He suddenly felt an overwhelming desire to go to the mall. He wanted to go there. He frowned. That was what his wish had done? He didn't have to go to the mall, he now NEEDED to go to the mall?
He looked at his wishing stone suspiciously. "You suck." At least he'd dodged a bullet.