Too cool not to share

I stumbled across this video some time ago, and it's just too good not to share:



That stuff in the pool is oobleck -- a mix of cornstarch and water. Being the skeptical one as usual, I tried making up my own mixture at home, and it certainly works as advertised -- solid when it was hit (or impacted with a sudden force) and liquid otherwise. Though, given how it was almost impossible for me to yank my spoon out of the mixing bowl, I wonder how much trouble it took them to get those two guys out of the pool at the end...