There is a strange phenomenon that happensevery year in North-East Thailand. During the first week in October, around the final day of Buddhist vassa, small fiery orbs shoot up out of the Mekong river and disappear into the night sky. The cool thing is that no one is really sure what they are or why this happens. Explanations range from combustable river sediment, to tracer fire, to the belief that they're caused by a great snake in the river. (That's how they got the name naga fireballs). I read about this a while ago and really wanted to get up to see it but by the time I noticed it again in the paper there wasn't enough time to take the train out to Nong Khai before the festival ended. Bummer. So anyway, here's a youtube clip of the fireballs in action. Enjoy.