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.

Once she's done, she goes to the kitchen to have a drink.

As she enters, she sees her husband there, reading a magazine.

"Hi Darling", he says, "Your parents have come to visit us, so l let them stay in our bedroom. Hope you said Hello to them."