This seems like BS but it's kind of fun anyway. Watch this Youtube report of an urban legend about a mysterious mind-controlling arcade game from the 80s. After the opening text, skip to the 4:00 minute mark so you can miss all the boring DOS commands loading. You'll then be treated to more (often misspelled) text outlining the various subliminal commands. Try not to blow your mind.
(This reminds me that we should track the subgenre of video game-related horror flicks. I can think of 1 and a quarter: Stay Alive and the Emilio Estevez sequence in Nightmares.)