Music is not my own. I got it from • Soundtrack Star Wars: ...
Corn starch and water is commonly thought of as a non-newtonian fluid, and it is. However, it is actually part of a smaller category of non-newtonian fluids - dilatant or shear thickening fluids. In this video I'll discuss that briefly, then I'll go into some applications for dilant fluids. The last half of the video shows some tests of how corn starch and water responds to various stimuli.
The "Zig Zag drizzle" is interesting, and I thought of a way to explain, although I haven't confirmed this. The flow drizzling from the spoon does not have a uniform shape and hence its velocity profile is not uniform. As one side of the stream of fluid has a higher velocity it becomes stiffer and suddenly slows down, this causes the flow to "zig" to one side. Once the other side speeds up then it becomes stiffer and the flow then "zag's" back the other way.
Here are some references:
(1) homepages.engineering.auckland...
(2) en.wikipedia.org/wiki/Viscoel...
(3) physics.stackexchange.com/que...
(4) proceedings.asmedigitalcollect...