Husband: what's in the black bag?
Me: (working in home office)I'm going to need more than that.
Husband: the black bag in the refrigerator.
Me: I don't know. Did you LOOK in the bag?
Husband: no. (Looks in the bag) oh it's the leftovers from my lunch.
EDIT: delighted to find how right I was that this interaction defines many a marriage!