i may have mentioned this before —- there is a man in our community who is not well (unmedicated schizophrenia if i am guessing correctly) and has many many OCD tendencies. He used to be a huge masmid ‘before’ so his knowledge base is vast.
After his father died he knew that if he extended Shabbos it would keep his father out of gihenom so he started keeping shabbos until the latest possible time he could figure (Tuesday) and would restart it at the earliest possible time. His father has been gone many years and I am sure is comfortably seated in gan eden but this man keeps certain halachos from wednesday to tuesday every week. such as not going anywhere where there is a video or security camera or motion sensor lighting.
when i tried hard to argue with him that his ‘rule’ has left him homeless (literally), he brought me sources upon sources and names of rebbas who kept this and that – totally out-sourced me.