Its an ionic Nestea commercial run in the 1980's and early 1990's where the actors drink Nestea drink. As the person begins to drink the tea they begin to experience a new reality, the ground around them turns into water. They are refreshed, full of both joy and tea, and begin to fall straight backwards into the water. This display of energy and emotion creates a desire for the fun-filled free fall. People nationwide reenacted the Nestea Plunge by falling backwards from a waters edge.
The Nestea Plunge is simply falling backwards into a pool.