The boys have discovered the penny box.
Not only did they do what you can see here, there are pennies everywhere in my house. They are in between all of our clothes on the shelves in our closet. I had to dump out the large pickle jar to remove and separate all the pennies out from the silver coins. I had to fish some pennies out of the toilet in my bathroom (thank you, Jonah), and I found some in my bed (?), under the sink in my bathroom and in my bathtub.
Pennies aren't my favorite right now.