While golf balls and glass windshields have teamed up for some notoriously, awful outcomes,  metallic stones in glass containers are essentially their equal in terms of consequences. The metallic stones often form a sphere, presumably due to surface tension of the molten metal, but the dimples formed in this specimen evoked the cover of a golf ball. Compositional analysis revealed that it primarily was constituted by iron with a small amount of nickel. Thus, it was likely caused by the unplanned introduction of carbon steel or a cast iron impurity into the internal or external cullet. Although iron stones are not highly stressed, this particular stone was the origin and primary cause of breakage for this beverage container that failed during a retort operation under the influence of a thermal shock load.