Shall I post gore, decomposed corpses, screamer gifs, and videos? You can be scared by your own imagination god damn it.
I don't think Slender can be very scary to me.
Slender and SCP are just fads, and imo aren't very good games.
Containment Breach is scary the first few times, then it loses it's touch and its just "173 get the forget out of the door way for SIX loving SECONDS so I can get by" every time.