The discussion centers around an unusual phenomenon at the beach involving an abundance of purple jellyfish. Observers noted the presence of various jellyfish remnants scattered along the shore, leading to speculation about their sudden demise. A local mentioned a "red tide," a plankton bloom that can affect marine life, which may have contributed to the jellyfish's decline. Participants debated the jellyfish's condition, questioning whether they were killed by the red tide or if they were merely damaged by the waves before washing ashore. The conversation shifted to the potential effects of warm water and environmental factors, including the impact of fireworks on the jellyfish. Overall, the thread highlights curiosity about marine biology and the interactions between environmental conditions and marine life.