So I'm guessing the scientific explanation for this is probably quite boring. 

However, it is rather freaky at the same time and if I'd stumbled upon this on acid I'd probably be tempted to throw myself down and offer myself to it. 

http://www.youtube.com/watch?v=Fr_T5oxNkNA

hahaha... yeah that would be a trip to see that.

This comment says it all: "It's actually the lure of a much larger animal that dwells underground. You're lucky to be alive."

I imagined thousands of tiny insects high on E swinging on the thing to insect techno.

High metal chimneys are equipped with a spiral extension around the stem to prevent that phenomenon. It's caused by wind. That's my guess. 

As you see, the stem of the plant is very, very thin. Was it much thicker, or if the leaves of the plant unsymmetrical or spread, the swaying wouldn't take place. 

It is a video of a Palmaceae apparently made by mountain bicyclists who seem to have ignored the fact that these palms are ubiquitous until the moment that the bikers noticed that they were riding in a palm forest


This probably has something to do with full suspension.

:-)

Someone must be feeding that plant a mixmash of hormones. 

Can't you guys recognize an espresso plant when you see one?