 Item number SCP-3566 Object Class, Euclid Special Containment Procedures Television studios producing situation comedy style shows are to be monitored for SCP-3566 manifestation. Should any production begin showing signs of SCP-3566 manifestation the studio is to be encouraged to add a laughter track to the final edit. Should they resist, the production is to be terminated. Outside of testing, viewing of affected media should be limited to approximately 20 minutes, the typical length of SCP-3566 susceptible programs. Description SCP-3566 is a phenomenon affecting studio recordings of television programs in this situation comedy genre, manifesting as the sound of laughter occurring over the top of the standard soundtrack of the show. The sound typically consists of an unknown number of voices laughing at inappropriate moments during the show and often for extended periods of time. SCP-3566 manifestations change with each subsequent viewing and have been described by observers as unsettling or manic. The occurrence rate of SCP-3566 is currently approximately 10% of potential candidate shows. To date, no shows have been affected retroactively following the airing of their first episode. Individuals exposed to SCP-3566 for a prolonged period, greater than 30 minutes, will begin to suffer from headaches and dizziness. After 60 minutes of exposure, the effect of SCP-3566 will transfer to the viewer themselves. They will regularly hear the associated sound without any identified source. Footnote. People suffering from this effect typically describe the sound as coming from the left or right of the direction they are currently facing. After suffering from this effect for approximately one month, in addition to the mental health issues that would typically arise from the presence of frequent auditory hallucinations, the individual will begin to undergo personality and behavioral changes. These changes are typically expressed as the extreme exaggeration of one or more aspects of the individual's personality or demeanor to the point that they override all other observable traits. SCP-3566 was first discovered in the 1940s. A number of affected television programs at the time were terminated prior to airing, before it was discovered that the addition of actual laughter either from a live source or added in editing after recording suppressed SCP-3566 manifestations. Encouraging the use of laughter tracks in various television studios helped significantly reduce the rate of occurrence of SCP-3566 and has since become an accepted norm of the format. Examples of results of exposure to SCP-3566 Subject D-32562 Result Subject showed a dramatic decrease in intelligence and information recall over a period of three months, forgetting commonly known historical events of which they were previously aware, frequently misspelling basic words and mispronouncing words they had previously used without issue, culminated in an almost total collapse of communication skills and information retention after approximately six months. Subject D-6521 Result Subject began to display a startling level of gullibility. After four months, the subject had lost all ability to discern truth from fiction. He would believe everything told to him, even if it contradicted previously given information. Subject D-98262 Result Subject became increasingly aggressive and hostile towards foundation personnel over a two month period, culminating in a violent incident over a perceived slight in an innocuous greeting that resulted in his death. Subject Agent Tam Harding Footnote Agent Harding was accidentally exposed for approximately 90 minutes when rendered unconscious during an unrelated containment breach. Result Subject became extremely compliant and obedient. Four months after exposure, the subject was unable to undertake any action, even basic bodily functions, without being ordered to do so by a superior. Addendum 1 On August 11, 1972, an SCP-3566 manifestation occurred differing from its usual behavior. Instead of laughter, the sound of pained screams could be heard over the entirety of the host's show. All subsequent events since this state have followed the same pattern, though the original containment procedures still appear effective at suppressing its occurrence. Individuals exposed to this new form of manifestation for prolonged periods report sensations of dread and impending doom. Followed by the sudden onset of Schizoid Personality Disorder, characterized by apathy, detachment, and a lack of emotion, or in rare instances extreme cases of Paranoid Personality Disorder. Addendum 2 Following advances in audio analysis techniques, the sounds produced by SCP-3566 affected media were analyzed and it was determined that they all originated from a single voice, distorted to sound like multiple people. Comparisons with historical interview recordings made in the early days of SCP-3566's containment showed the voice to be a match with Tommy Tolico, an engineer interviewed during the initial investigation. Investigators at his last known address found a desiccated corpse on a chair in a basement, believed to have died at some point in the early 1970s. Footnote, Tolico was reported as missing to the police on November 11, 1972. The chair was facing a television set and the corpse was wearing a face mask connected to an empty tank of nitrous oxide, commonly known as laughing gas. Also discovered was a piece of broadcasting equipment matching no known design, the purpose of which is currently under investigation. Site 42 is able to continue broadcasting and move up to making live-action SCP adaptations thanks to support from our viewers, subscribers, and especially our patrons. Special shout out to our Level 5 researcher-level patron, Andre Beichert.