Power shovel

My son, Ken, loves to watch power shovels. When he finds it, he always shouts to me that there is a power shovel. "A blue power shovel !" he tells me, "Blue power shovel, not working" "A yellow power shovel, stone !". At the same place, he always shouts "I found a yellow power shovel !" before he sees it. And he goes on talking, "the yellow power shovel shits in the toilet".