On October 21, an experiment was conducted in our library laboratory «Funny Science», during which we found out how a non-Newtonian fluid works. The experiment can be done at home, because for its implementation you will need ordinary water, starch and any free container. Experience demonstrates how a non-Newtonian fluid changes its viscosity and density properties under physical, mechanical, or even sonic impact. This happens because at a high interaction rate, the massive liquid molecules do not have time to rearrange themselves due to inertia.