MARKET RESEARCH One day, while doing door-to-door market research, a guy knocks on a door and is greeted by a beautiful young housewife. "Hello," he starts," Iâ€™m doing some research for a petroleum jelly manufacturer. Have you ever used the product?" "Yes," says the woman. "My husband and I use it during sex." The researcher is taken aback. "Well, I admire your honesty," he stammers. "Can you tell me exactly how you use it?" The young housewife replies, "Sure, we put it on the doorknob so the kids canâ€™t get in."