TheBackyardScientist has set up some backyard experiments with balloons filled with cornstarch and water. This mixture forms what is called a non-newtonian fluid. It’s liquid when at rest, but hit it with a sharp, quick force and it turns into a solid. In the video above they compare balloons filled with water to those filled with this substance. All in all it’s pretty standard stuff. The best bit however is when they shoot it with a golf ball. Oh, did I mention that they have a high speed camera set up filming this? They do, that’s what makes this so fun. And the golf ball shot, that’s awesome.