"Gene showed up to set and I told him what to do, where to look and all that. He had to do this whole speech about the "primeval swamp" or something like that. So, he asked me where the primeval swamp was, and I told him that we'd have to shoot it later, but for now, he would just look offscreen. So he erupted, "You call yourself a director? How am I supposed to play this scene without seeing the primeval swamp?" And I just said, "Well, Gene, you're an actor. Isn't that what actors do? This is not Shakespeare. If anyone can fake it well, you can". And it wasn't quite the same after that, to be honest."
January 1, 1970
https://en.wikiquote.org/wiki/Superman_IV%3A_The_Quest_for_Peace