Black Plastic Pallets

I see huge black plastic-- layers of large squares stacked and skating ominously through the grocery store on small wheels. Thick and huge, huge and thick. I see them transported back and forth, in and out of swinging doors. I wonder what they weigh. 'Wonder what they cost. They must be trading them on the black market, because they're black and they are in the market. Someone's trading them for wood ones. They would want wood ones instead of plastic. Then they place plastic instead of wood ones in their place. The place is full of black plastic pallets, and no one's calling the police.