Ok this is fiction, but its extremely well written, and has just the right dose of creepiness in it to give you chills down your spine.
Mor importantly, however, it makes you think.. it brings up questions about reality, mind, and existance as we know it. It does a great job at getting those paranoid thoughts to the surface.
Do you think you can handle it? Its quite long, but very very worth it. Check it out.
http://www.pointlesswasteoftime.com/jdate/intro.html
And when you are done reading, pick up your jaw off the ground, and post your thoughts about what you've read.