A couple of minutes later:
My husband (peeking round the door of the baby's room, mouthful of cake): What exactly did you want me to do with the kettle once it boiled?
Me (I regret to say, slightly irritated, jiggling a teary baby): Um, just turn it off??
My husband: Oh! I thought that's what you said, but then I thought it couldn't be quite so simple!
Oh dear... I really must be high maintenance...