From SCP's, to reddit nosleep, to good old-fashioned creepypastas. I like a good spook story, period. Turn out the lights. Take your pick.

The SCP wiki is the largest collaborative writing project ever. The SCP wiki's website is home to tons of creepypasta, speculative fiction, science fiction, and world-building. The universe this writing collaboration focuses on centers around a fictional organization called the SCP Foundation. Standing for "Secure, Contain, Protect," the organization is dedicated to protecting the world's normalcy from anomalous phenomena. The majority of the website's articles are dry overviews of the various monsters and artifacts the Foundation has secured.

These are my favourites. Some are more well-known than others.

• SCP-087 - The Staircase. SCP-087 is an unlit platform staircase leading infinitely down. Subjects report and audio recordings confirm the distressed vocalizations from what is presumed to be a child, somewhere lower down. However, any attempts to descend the staircase have failed to bring subjects closer to the source.
• SCP-173 - The Sculpture. This was the first SCP entery ever written, and it was posted anonymously. This object is a dangerous statue that must be watched at all times or it will animate.
• SCP-055 - [unknown]. None of the researchers containing this object know what it is. It's not that the object can't be observed, but it's that it cannot be remembered after looking away.
• ●●|●●●●●|●●|● - ♪ ∅, ! ✓.
• SCP-___-J - A rock that makes you procrastinate. (insert description later)
• SCP-1609 - The Remains Of A Chair. Despite the universe being named after them, the SCP Foundation isn't the only organization involved in the strange. In SCP-1609 by Rioghail, readers encounter an object that has run afoul of the Global Occult Coalition. While the SCP Foundation is often criticized for locking up anomalies, the GOC is worse.
• SCP-682 - Hard To Destroy Reptile. The SCP Foundation tries not to destroy anomalies, and they only make exceptions for very dangerous ones, like SCP-682 by Dr Gears and Epic Phail Spy. Unfortunately, this danger lives up to its name by being basically immortal.
• SCP-999 - The Tickle Monster. Not all of the monsters contained by the Foundation are dangerous to human; one of the most benevolent a glob of orange slime that wants nothing but to bring joy to people. This is SCP-999 by ProfSnider, an anomaly rated as "Safe Class." It possesses the ability to make anything laugh.
• SCP-096 - The "Shy Guy". This pale man will relentlessly pursue anyone that sees its face.
• SCP-1733 - Season Opener. SCP-1733 by bbaztek is a recording of the real 2010 season opener NBA basketball game where the people in the tape are aware it's a recording.
• SCP-2316 - Field Trip. Another notable cognitohazardous SCP, Field Trip refers to a collection of bodies in an unidentified lake that takes on the appearance of the long-forgotten childhood friends of whoever happens to be viewing it. The exact details concerning the SCP aren't known, and the Foundation urges those who come into contact with SCP-2316 to repeat the phrase "you do not recognize the bodies in the water.".
• SCP-701 - The Hanged King's Tragedy. SCP-701 refers to a five-act play titled "The Hanged King" that is known to induce mass hysteria in audiences. The SCP universe features multiple antagonists, and the Hanged King is one of the most prolific. The monarch of the otherworld city of Alagadda, his influence is far-reaching, and his motives and goals are dark and horrific.
• SCP-426 - A Toaster. I'm just an ordinary toaster.
• SCP-106 - The Old Man. The Old Man is among the most recognizable and notorious early SCPs. A living being that resembles a decaying corpse, SCP-106 is a predatory creature capable of lying motionless for days at a time while it waits for pray. Able to pass through solid matter and erode anything in its path with an anomylous corrosive substance, the SCP is difficult to contain and extremely dangerous.
• SCP-3001 - Red Reality. SCP-3001 by OZ Ouoroboros is an excellent short story set in the universe. It expands on the backstory of SCP Dr. Robert Scranton, who in previous articles was established as being the creator of an important piece of technology. This is where the collaborative nature of the universe really shines, being able to add more to characters mentioned in afterthought elsewhere—and the article itself is both existentially horrifying and overwhelmingly sad. The SCP in question isn't a monster or an object, but an extra-dimensional space. The horror comes when Dr. Scranton accidentally finds himself trapped inside of it. What follows is a disturbing portrayal of one man's loss of sanity and the effect that his disappearance has on the people who are left behind. It's a thoroughly engaging exploration of a character in isolation, and it does an exemplary job of illustrating the dangers that lie around every corner of the SCP Foundation's universe.
• SCP-001 - When Day Breaks. The SCP wiki does not list a singular SCP-001. Rather, it lists a series of "proposed" anomalies that could fill that position, and most of these pertain to entities or objects capable of either creating more SCPs or causing the end of the world. When Day Breaks refers to a theorized phenomenon that would cause sunlight on the visible spectrum to turn organic material into masses of amorphous, gelatin-like flesh.
• The Antimemetics Division Hub.
• Top Rated SCPs.