These three boys are using small shovels to scrape the oobleck (cornstarch and water mixture) from an elevated platform over the water table. Oobleck is a colloidal solution that has dual properties of both a solid and a liquid. You can see as the boys scape the oobleck it forms a mass, but when they drop it back into the water table, it almost pours like a liquid. One of the boys says: It's a corn shredder." Later he says: I think this is the grossest thing in the whole world."