This is a video of a surfer in San Diego surfing in the midst of bioluminescent algae that, when disturbed, glows bright blue. Video after the break.
On the beaches of Southern California, a phytoplankton called Lingulodinium polyedrum is responsible for a spate of red tide. Massive algal blooms like this make the water ruddy during the day, but disrupting the microorganisms at night results in bursts of electric blue bioluminescence.