Scuds are a form of entertainment where you place a can of cheap beer in coals of a fire. Make sure the side you drink is down in the coals. Wait til you hear a pop of the aluminum as the liquid expands. Make sure everyone is a safe distance away and wait. The can should shoot up around 10 to 30 feet in the air. If the can tips over, step back farther as it will blow up. You may get spattered with beer if you are to close and maybe a couple of coals from the fire.
See the attached video of a can that tipped over.