I ask my friend Madeleine about the time she wouldn't stop watching the 1992 documentary Titanica. Titanica is about discovering the wreckage of the Titanic at the bottom of the ocean where it rests, plus it inspired James Cameron to turn Leonardo DiCaprio into a teenage hearthrob. 

She tells me what she remembers from the movie (which isn't a lot), and then we both go and watch it in order to discover the reason she was obsessed with long underwater shots of rusting metal.