Maybe not, but the question clearly states that I can post my favourite, which is Squidward's Suicide. It's a very detailed and disturbing Creepypasta; due to the fact that it's based on one of my childhood favourites, it's very easy to imagine every small detail.
Originally Posted by Kilcreed
Squidward's Suicide was the first I ever came across, it's not scary, it's disturbing. Especially if you watch the episode.
I agree. I can think of a lot more scarier Creepypastas, but the disturbing and detailed nature makes this one unique. The video's good for a laugh too xD
Here's another for all you Legend of Zelda fans, this is one of the more popular pastas, check out BEN: The Haunted Majora's Mask. There's gameplay videos that you should watch in order, when prompted to.