As is often the case with "cautionary tales" which these Gothic Horror legends there is a warning to portray. These are a couple of adaptations to the story:
Two
dorm-mates in college were in the same science class. The teacher had just
reminded them about the midterm the next day when one dorm-mate - let's call her
Julie - got asked to this big bash by the hottest guy in school. The other
dorm-mate, Meg, had pretty much no interest in going and, being a diligent
student, she took notes on what the midterm was about. After the entire period
of flirting with her date, Julie was totally unprepared for her test, while Meg
was completely prepared for a major study date with her books.
At
the end of the day, Julie spent hours getting ready for the party while Meg
started studying. Julie tried to get Meg to go, but she was insistent that she
would study and pass the test. The girls were rather close and Julie didn't
like leaving Meg alone to be bored while she was out having a blast. Julie
finally gave up, using the excuse that she would cram in homeroom the next day.
Julie
went to the party and had the time of her life with her date. She headed back
to the dorm around 2 a.m. and decided not to wake Meg. She went to bed nervous
about the midterm and decided she would wake up early to ask Meg for help.
She
woke up and went to wake Meg. Meg was lying on her stomach, apparently sound
asleep. Julie rolled Meg over to reveal Meg's terrified face. Julie, concerned,
turned on the desk lamp. Meg's study stuff was still open and had blood all
over it. Meg had been slaughtered. Julie, in horror, fell to the floor and
looked up to see, written on the wall in Meg's blood: "Aren't you glad you
didn't turn on the lights!"
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As told by Jon Little...
I
heard about a girl who went back to her dorm room late one night to get her
books before heading to her boyfriend's room for the night. She entered but did
not turn on the light, knowing that her roommate was sleeping. She stumbled
around the room in the dark for several minutes, gathering books, clothes,
toothbrush, etc. before finally leaving.
The
next day, she came back to her room to find it surrounded by police. They asked
if she lived there and she said yes. They took her into her room, and there,
written in blood on the wall, were the words, "Aren't you glad you didn't
turn on the light?" Her roommate was being murdered while she was getting
her things.
(I've
heard this several different times. Each time it was at a different
university.)
One consistent theme in these teenage horrors is that as the adolescent moves out from home into the larger world, the world's dangers may close in on him or her. Therefore, although the immediate purpose of these legends is to produce a good scare, they also serve to deliver a warning: Watch out! This could happen to you!
Through these adaptations I have discovered that the main plot to the story is that someone is killed right under the nose of an unsuspecting protagonist, who is often female, but because the lights are out, the victim's body isn't discovered quickly, and often not until the next morning.
As the story is sometimes told, the protagonist hears suspicious noises but is afraid to investigate because she thinks it could be an intruder coming after her.

