For example...

A wife comes home late at night and quietly opens the door to her bedroom. From under the blanket she
sees four legs instead of two. She reaches for a baseball bat and starts hitting the blanket as hard as she can. Leaving the covered bodies groaning, she goes to the kitchen to have a drink.
As she enters, she sees her husband there, reading a magazine. "Hi, sweetheart," he says. "Your parents have come to visit us, so I let them stay in our bedroom. Did you say hello?"