Author theLittleFears is one of those horror writers who really know how to use novel terrors from real life to enhance a horrifying story's effect. Sudden Onset's story is simplicity itself. A 14-year-old boy with strep throat participates in a "Bloody Mary" ritual during a sleepover. He and his friends gather in front of a mirror, turn the lights off, and then say "Bloody Mary" into the mirror three times, hoping that a ghost will appear.
We don't know what happens during the ritual, but we are told the aftermath is that the boy is now afraid of mirrors, feels fingers brushing against him at all times, and consequently lives a life of fear.What allows this to transcend being a regular spook show is that theLittleFears explains that the boy was diagnosed with pediatric autoimmune neuropsychiatric disorder-a real condition where children with strep throat suddenly begin to have horrible hallucinations.
Thus, this creepypasta straddles the line between the horrors of fact and fiction (and paranormal and normal) to an unusual degree. Does it really matter if there's actually no ghost of "Bloody Mary" haunting you when your nerves keep telling you she's got you in her fingers anyway?