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A sneaky trick that stops people from copying videos by making their VHS machines go haywire if they try to record from two machines at once. It's like the DVD version of a middle finger.
"I tried to copy this movie, and my VHS machine started yelling at me.", @VHSFanatic99
"Macrovision is just the video world's version of a restraining order.", @DVDHater42
"I tried to record a movie, and my VHS started screaming in binary.", @RecordedRage"