Jarsquatter, also known as 1 Man 1 Jar, is a shock video. It starts by showing a naked man and a glass jar. The man then proceeds to insert it in his anus by sitting on it and forcing it up. The jar then breaks inside his rectum, after which blood pours from his anus. Without flinching or making a sound, he calmly picks pieces of broken glass from his rectum, while a pool of blood gathers on the floor. After removing all the glass pieces, he stands up and lets out a scream of pain. A text over the video box says: "If you think you've seen everything...well, just watch this clip."
There is a more widely known version which cuts out the scream at the end (scream which, according to the maker of the video, wasn't from him: it was added by someone else).
NOTE: The following shock site contains graphic content.