Spongebob's Sailing Stone

Spongebob rode a stone in one late episode of his series. I thought it was only something the makers made up. See the video below for the cut scene from the series.

The stone, the sailing stone, turns out to be something real! In the USA, scientists recently recorded how stones on dried Death Valley. Here, have a look on a video capturing the stones move, which left a serpentine trail. The stones' movement were possible due to extreme weather changes.