Archimedes' screw sticks motion - GIF

[Frank S]

Both of them look staged or rigged to me, but it is not something I have ever tried. I have poured water into a vessel though and most anything floating would initially be forced away from the cascading stream then it might come around and be caught in the down flow.
The Archimedes screw could lift water if in a close fitting trough but for an object to defy not only gravity but the downward force of the water and rise up without assistance does not fit with any laws that I am familiar with.
the same goes for the cork screw shaped flotsam in the stream it is traveling at a rate of speed highly inconsistent relative to the speed of the water in the stream. A very thing fishing line would have to be attached to it and pulled just below the surface.
But that is just my opinion. I'm not from Missouri but you still have to show me