Zomb-Omb

Zomb-ombs are the recently detonated shells of Bob-ombs that have been possessed by Boos. While they are no longer able to detonate (for obvious reasons) they are still extremely heavy, and will attempt to throw themselves at Mario/Luigi in order to damage them. Upon hitting the ground, however, they're still capable of sending off a few sparks, most likely due to gunpowder residue.

When a Zomb-omb is jumped on, it's brittle casing shatters and falls to the ground. Much like Dry-Bones, their pieces soon re-assemble themselves. Unlike Dry-Bones, however, these pieces can be kicked similarly to an upside down Galoomba, getting rid of the Zomb-omb permanently.