This had been happening recently:
One of the budgies was knocking the seed cups down, spilling perfectly good seed on the bottom of the cage. We suspected Dewey. Though mild-mannered, he has been known to knock around the food cup when it has too many pellets (and not enough oats) in it. But to be sure, we set up the CooperCam to see who the culprit was. We later fast forwarded through three hours of footage and saw this:
It was Sunny! This little one definitely has a naughty streak.