My guess is that these are connectivity exercises.
Thats fine if they are actually connected, but if you watch both videos, especially the one FiuzA replied with, theyre not connecting at all. Nage is waving his hands around and uke is just jumping.
So my question now is, whats the point of being involved in something theatrical or "fluffy"? Ive seen osenseis ukes do some things in demonstrations that i would call questionable, but this is a little rediculous....