Autobomb

The Autobomb is a cart-like enemy in Super Mario Bros 2 and It has a cannon attached to it. A Shy Guy is always riding on these. Autobombs move around shooting fireballs at your direction. The fireballs can hurt you. Autobombs can be defeated by Starman's effect or a thrown vegetable. You can throw the Shy Guy off the Autobomb and ride it. In World 4-2 you had to do this to cross the spikes.