A husband and wife and their two sons are watching TV. She looks at her husband and winks at him, he gets the message and says, "Excuse us for a few minutes boys, were going up to our room for a little while."
Pretty soon one of the boys becomes curious, goes upstairs and sees the door to his parents bedroom is ajar. He peeks in for a few minutes, trots downstairs, gets his little brother and takes him up to peek into the bedroom.
"Before you look in there," he says, "keep in mind this is the same woman who smacked our butts just for sucking our thumbs."