Head (1968)

Running in from seemingly nowhere, Micky Dolenz, Davy Jones, Michael Nesmith & Peter Tork - better known collectively as The Monkees - disrupt a bridge opening ceremony.

From where and why did they come to disrupt the proceedings? They were filming a series of vignettes in several different genres, including a wild west sequence, a desert war sequence, a Confederate war sequence, and a science fiction sequence. They disagree with much of what is happening around them, and try to figure out how to escape the oppression they feel - symbolized by a big black box in which they are seemingly imprisoned - by the forces around. That oppression is often shown in the form of "The Big Victor Mature".