Early in the day north of Toronto Canada I found this cluster of water striders near a log shoot. The current was pushing toward the shoot but they were jumping away. Also known as Jesus Bugs for their ability to "walk on water" these creatures have an amazing ability to jump stochasticly (was "random" but stochastic is much better).
A nice video allowing us to watch the sporadic dances of water striders. Completely random? Likely not, but motivated, complex and stochastic in equal measure perhaps.