I purchased a copy of 2001 edition of The Rough Guide to Cult Movies (subtitle: The Good, the Bad, the Very Weird Indeed) 18 years ago, and ever since, it has been a trusted resource for discovering films that may be good, may be bad, but almost certainly are interesting in a way.
I decided to put all the films that got their own entry in the book into one list, to help me keep track of how many I have watched (and maybe to help other people find films of interest). In the notes, I will add the section in which the films were added.
Note: Charade, The Long Goodbye, Once Upon a Time in the West, and Pulp Fiction have entries in two sections each. Deep Throat, which has an entry in the X-rated section, is not on Letterboxd.