You don't know how to open a coconut

Gum has a gelatin-based component, a non-Newtonian fluid, and the viscosity will increase under the action of a large external force, and the greater the external force, the greater the viscosity. When the coconut hits the gum at a high speed, the gum viscosity increases rapidly, and it behaves as hard as a solid, thus breaking the hard shell of the coconut.