Gravity (1976)

In this spoof of publicschool educational films young Mary Jane asks the question What is gravity After asking various dysfunctional family members without success she then asks Dr Waxman of the Karl LaFong Foundation for Gravitational Research motto heads in the clouds and feet on the ground who explains that gravity is caused by a substance named GR12 Unfortunately the world is running out of GR12 The cartoon character Jiminy Gravity then explains in song how we can conserve gravity with such practices as sitting on the floor and carrying helium balloons