There have been many but I'm gonna plump for a film that I saw in the flicks when under age. One of many I saw under age actually. "Caligula" by Gore Vidal. Absolute tripe and the acting is utterly cringeworty. To think three of our finest appeared in this and were all terrible, John Gielgud, Peter O Toole and Helen Mirren Almost makes Keanu Reeves look like a convincing thespian. If you haven't seen it, please do. You'll be amazed at the depths it plumbs.