Bag of dirt

The bag of dirt is an object I.M. Meen discovered in Mario Head's Lair. It is filled with dirt, of course, but Ophelia Chill and Sinistar were hidden in there as well. I.M. Meen likes to sing and dance when he holds it. Once, the singing got on Weegee's nerves, so he took it, threw it into the air, and shot it with a shotgun. This revealed Sinistar.