To the question "have you done homework / chores / whatever I asked you to do," the answer "yes" is best regarded as a "no."
The more emphatic the "yes," the more likely it is to be "no."
The loudest shout from one room to the next will go unheard, but the muffled clink of a cookie jar lid can be heard clearly through three closed doors.
The words "just try it, you might like it" have never had any credibility. They didn't fool you, why would they fool your kids?
Today's "must have" absolute number one all time favourite cereal / snack / soft drink will languish, unconsumed, in the back of the cupboard for the next year.
This sometimes manifests itself as a stealth attack, wherein the item will be avidly consumed week after week right up to the point where you decide to buy it in bulk.
The best way to conceal an item is to leave it lying in the middle of the floor, preferably in a high-traffic area such as the top of the stairs, masquerading as something in need of being picked up and put away. This will render it entirely invisible.
Whenever you check the kitchen clock, leaving yourself just enough time to ferry child to music lesson / scouts / appointment with parole officer, the thirty seconds it takes to grab car keys and put on shoes will have mysteriously stretched to at least five minutes by the time you reach the car. I think Einstein's to blame. Somehow.