Eeeewwwwww. I know.
I couldn't figure it out. There would be maybe 1 brown piece for every 20 perfect pieces for the last few days. I decided that a kid must have spilled some Coca-Cola in the machine or a piece of ice cream had gotten over in the machine. I was wrong.
I just watched William walk to the freezer, open the ice drawer, remove a piece of perfect ice and rub it on his head. 20 seconds maybe. I said, "What are you doing?" He said, "Faithy and I cracked nuggets." Then he threw the piece back in and went about his business.
Brown Ice - Grosser Than I Thought.