Child running into room: "Mama! Margaret has something I want and she won't let me have it!"
Me: "You will have to wait until she is done."
Child: "Ohhhhh. That'll take a long time!"
Me: "Well, let her have it now and you can have it when she takes a nap later."
Child leaves sulking. Overheard from next room in a sweet sing-song voice: "Margaret, are you getting sleepy?"