I was brown bear hunting on Afognak Island in Alaska during the springtime. We had rented a floating cabin that was anchored in a slough. One evening after my 4th or 5th can of barley pop I went outside to relieve myself over the side. As my borrowed beer hit the water it started to sparkle. At first I thought it might have been from all those drugs I took in college but then I realized it was bioluminescence from plankton in the water. That was so cool I had to go back in and rehydrate myself so I could watch it again!
Uh ... yeah. Good excuse. I'll have to use that one on my wife.