A businessman and his secretary, overcome by passion, go to his house for an early afternoon quickie. "Don't worry," he assures her, "my wife is out of town on a business trip, so there's no risk." As one thing leads to another, the woman reaches into her purse and suddenly gasps, "We have to stop! I forgot to bring birth control!" "No problem," he replies, "I'll get my wife's diaphragm." After a few minutes of searching, he returns to the bedroom in a fury. "That witch!" he exclaims. "She took it with her! I always knew she didn't trust me!"