We’ve already reported on just how dangerous so-called “lava bombs” – solid pieces of debris that are ejected from active volcanoes – can be as the ongoing eruption of Hawaii’s Mt. Kilauea has threatened the lives of nearby residents, forcing them to flee. One man even suffered a broken leg after being struck by a seemingly small (but powerful) piece of debris. The latest close call unfolded on Monday, when a volcanic explosion sent a basketball-sized “lava bomb” crashing through the canopy of a tourist boat. It exploded, showering passengers with molten rock, according to the Hawaii County Civil Defense Agency.