Bob-omb

Bob-ombs are walking bombs that have been in the Mario series since Super Mario Bros 2 (or Super Mario USA in Japan). Since SMB3, they have had two white eyes, a fuse, two legs, and usually have a wind-up mechanism on their backs. In SSF2, they appear as dangerous items that are picked up and thrown (they have a small yet powerful explosion on contact). If they are left alone for too long, however, they light their own fuse and start walking around, blowing up when someone touches them (either directly or indirectly) or after a certain amount of time passes. They also drop from the sky after enough time passes in sudden death.