I saw this in Ha Long Bay in Vietnam in 1995 and it was magic. There were eleven of us on a boat trip, and on the second evening we saw this. You had to make the water move to make it happen, and first we got the anchor rope and swished it around, then we got all the men to piss off the side of the boat. They could write their name, like with sparklers! Being loaded with Vietnamese only added to the experience (in so many ways).

Wow, of all the times I've been on the beach at night in La Jolla or San Diego, I've never once seen that. Very cool!

I've seen jellyfish that do something similar along the gulf beaches now and then. Each time a wave would crash, it appeared as if someone had scattered weak flashlights in the water that tumbled with the surf. Flashes, glows, sparkles. I guess the surf stressed them out. It was erie to see it and not know what it was -- we searched for the source for quite awhile before we noticed it was happening all up and down the beach.

The ocean, at night, is a damn creepy place.

She just went swimming. Either it was topically effective or the small amount she naturally swallowed while swimming did it. She noticed a day or so later that the rash had gone away.