"Well, Troy," the scowling doctor said, "I see you're well over a month late for your appointment. Don't you realize that nervous disorders require prompt and regular attention. What's your excuse?"

"I was simply following your orders, Doc," Troy replied.

"Following my orders?" the confused doctor said. "What are you going on about? I gave you no such order."

"You told me to avoid people who irritate me," explained Troy.