Don't do this.
Save it for talk pages.
You guys really ruin (or further ruin) stories when you put things like THIS IS MY FIRST PASTA BE NICE or DON'T PUT INTO HORRIBLE TROLL!!11.
It's something that needs to go on the TALK PAGE of the article and nowhere in the body of the article. Putting PASTA BY X is fine, but the real appeal of Creepypasta is in the not knowing if what you are reading is real or not.
This is going to be enforced, but not punished unless you're really getting out of hand with it.
ALSO: Saying DON'T PUT THIS IN CATEGORY X, Y, OR Z means it likely belongs there and that's probably the first thing someone will do when they read it.
IF YOU DON'T WANT YOUR STORY IN THE HORRIBLE TROLL PASTA CATEGORY...DON'T WRITE A HORRIBLE TROLL PASTA!!!