Insurance

The woman at the insurance office inquired as to the costs, amounts paid, etc.

"So," she concluded, "if I pay five dollars, you pay me a thousand if my house burns down. But do you ask questions about how the fire came to start?"

"We make careful investigation, of course," the agent replied.

The woman flounced toward the door disgustedly.

"Just as I thought," she called over her shoulder. "I knew there was a catch in it."