The Monkees
The concept originated in the drug counterculture of the 1960s. Here's a keep-it-simple-stupid answer: A head film is a film that appeals to marijuana users (potheads), and/or users of other...
What specific group do you have in mind?
Kevin Costner counts 47 as the number of films in which he plays a role, including a few that were made for television. You can read the list, below.
The Monkees starred in "Head" (1968).
any one watching it