Excellent hand-painted "Raiders of the Lost Ark" movie poster from Ghana. Click to see it larger. This style of poster was frequently an advertisement for mobile "cinemas" where the operator traveled around with a VHS machine and TV to screen movies for paying customers. You can see more examples here and here. And there are several books documenting this art form: Ghanavision: Hand-Painted Film Posters from Ghana and two volumes titled Extreme Canvas.
David Pescovitz is Boing Boing's co-editor/managing partner. He's also a research director at Institute for the Future. On Instagram, he's @pesco.