Only possible answer for me, and reason I still keep a PS4 Pro I'll never get rid of.
Consuming horror media since childhood, played and loved the OG RE trilogy as kid (scared shitless), Silent Hill 2 as first PS2 game (scared shitless), played all those "horrors" in the 360/PS3 era, enviable horror BD collection. First time I've downloaded P.T., five minutes or so in and when nothing happened yet, I felt the need to stop playing.
Did a few loops, stared at that lit hallway and felt inside I was doing something wrong, like my subconscious recognized this stuff as potentially truly demonic in nature and dangerous. Sounds ridiculous, but it's the truth.
Only with VR I've been able to replicate that feeling.
And I'm 100% convinced the last, randomly generated portion of P.T. could seriously kill people in VR.
One reupload of a once legendary video I loved:
That said, can't wait to finally play Silent Hill 2 Remake in a few weeks.