Rude Awakening (1989)

"Two hippies came back from 1969 to get the bad news. Nobody wants to save the world anymore. They just want to buy it."

In the later 1960s, two hippies are forced to leave their friends as they are wanted by the FBI, who sees them as criminals. They hide in the jungle for 20 years, secluded from the outside world. In the later 1980s, the find out that a secret war is about to start in the US, and decide to return to New York to tell someone about it.