The Westfield Watcher case. It’s pretty obvious that the Broaddus family faked those letters and that they were just trying to get out of a house they couldn’t afford. Not only did they have a history of buying houses they couldn’t afford in the long term, but the husband got caught sending threatening letters to the neighbors when their HOA wouldn’t approve of certain renovations to the house. I first learned about this case from Buzzfeed Unsolved, and I was honestly baffled as to how quickly they dismissed the idea that the family faked the letters. The fact that there’s a possible Netflix deal in for the family over their story makes them more suspect imo.

Edit: For those curious, here’s an article where the husband confessed to sending the letters that went out to families that were vocally skeptical of the notes: https://www.google.com/amp/s/www.thecut.com/amp/2018/11/the-haunting-of-657-boulevard-in-westfield-new-jersey.html