Meal in a bucket

When I ordered a child's meal in a bucket at the local Gardens I didn't actually expect it to be served in a bucket like this, how bizarre! How do they wash them? Did they get a job lot from sand castles R us? If you tipped it upside down would you get a food castle? Many questions to ponder. I stuck with a conventional cheese and pickle sandwich, in a cardboard wrapping in case you were wondering.