Quote from : The Phantom Tollbooth Book

I warned you; I warned you I was the Senses Taker," sneered the Senses Taker. "I help people find what they're looking for, hear what they're listening for, run after what they're chasing, and smell what isn't even there. And, furthermore," he cackled, hopping around gleefully on his stubby legs, "I'll steal your sense of purpose, take your sense of duty, destroy your sense of proportion — and, but for one thing, you'd be helpless yet." "What's that?" asked Milo fearfully. "As long as you have the sound of laughter," he groaned unhappily, "I cannot take your sense of humor — and, with it, you've nothing to fear from me.