 in 4D, which is a theater with a seat shake and they spray water at you and who knows what else, because that feels more like an event than a movie. So that's my next movie I'm going to. I support your choices. Thanks, John. Coming up, 40 years ago, Prince changed music forever with the release of his best-selling album and film, Purple Rain. We talked to music journalist and Prince expert, Andrea Swenson, about her new book following the making of Purple Rain.