SCP-173 (found 4chan post; 2007)
From The Lost Media Wiki
The original SCP-173 post is a 2007 4chan post that lead to the creation of the SCP Foundation.
Background
SCP-173 was a creepypasta posted to the /x/ forum of 4chan in 2007.[1] The post described the procedures needed to safely contain a paranormal statue that could move and attack people when not looked at. The SCP Foundation, a popular writing website and creepypasta series, originated from the post.[1]