Lots Of Seaweed

Like many other items on this list, seaweed is not at all an usual sight in the ocean. But a gigantic influx of the stuff washing up on China's east coastline is bizarre enough to make number twelve on our list. The scientific reason has something to do with a breakout of algae bloom. But I think it would be more cool if they blamed it all on aliens.
This Post Belongs To Bizarre things that washed up on beaches