I read in an issue of "Fortean Times" about a guy that worked as a lifeguard somewhere. A small jellyfish had come drifting near the shore and someone scooped it up in a cup and had put it in a fridge to preserve it and this lifeguard came in and opened the fridge and that it was the cup of water he had put in there earlier and started to drink it and died when his throat swelled shut.

I remember being raided by jellyfish in the harbor at the Norfolk base. You could look down in the water on a sunny day and see hundreds down there it seemed like.

At night in the Persian Gulf I was on the weatherdeck looking down into the water as the ship was patrolling. I could see these large globes of lights flash down in the water next to the ship. Bright, whitish globes of light about a foot across, it seemed. Like very bright fireflies. They only flashed once but there were so many of them that the flashing was continual as we cut through the water. Another shipmate came out on deck and I pointed it out to him. We were both fascinated and sat on a bollard leaning over the lifelines watching these never-ending flashing lights down in the water close to the hull for I don't know how long.

I asked someone about them later and he said they were "polyps" and that one link someone posted mentioned jellyfish as being akin to polyps. Do jellyfish light up?