Discovered Hooptober at the same time as Letterboxd, but I went a few years before working up the nerve to commit to 31 horror films before October 31st.
Rules in Cinemonster's list.
I've given myself the additional restriction that everything has to be purchased, either cinema tickets or Blu-ray discs (or streaming services I guess which I completely failed to consider when making this list.) which is why this list is both (as yet) incomplete and also not filled with the most obscure films could think of.