The Pony Cum Jar Project is a notorious piece of internet history that originated on 4chan's /mlp/ board in late 2014. It began when an anonymous user shared an image of a Rainbow Dash figurine inside a jar, which they claimed to be filling with their own biological fluids over several months. The story reached its peak of infamy when the creator accidentally left the jar on a radiator, causing the contents to boil and turn brown, an event often referred to as the 'radiator incident.' While undeniably disturbing, the project became a legendary example of extreme internet subcultures and shock-value stories, frequently referenced in memes to signify the deepest levels of online degeneracy or catastrophic mistakes.