A non-Newtonian liquid is a complex paste or slurry that isn’t quite a solid or a liquid. It can actually exhibit the properties of both a liquid and solid depending on the circumstances. Gav and Dan of The Slow Mo Guys made a homemade non-Newtonian fluid simply using water and corn starch. The gloppy goop is both runny and thick. Weird. They put their concoction on a speaker playing music and hit record on their super slow motion camera. The resulting video is trippy to say the least.