The Mainframe is a film released in 1998 produced by Love Media with advertisments shown in Grand Theft Auto: Liberty City Stories. It is a clear parody of The Matrix, though The Matrix technically did not premiere until 1999 however it could also be a reference to the 1997 Canadian film Cube,in which six people find themselves inside a giant cube shaped structure just like the Mainframe. The movie poster shows pedestrians from Grand Theft Auto: San Andreas.
The movie is about five teens who take LSD and discover the 'truth'. They actually live in a computer. Quotes from the movie include
"What will it be? Yes, or no? 1 or 0?"
"Ahh! Your head is actually a big pixel!" "You'er not real,you'er just a virus"!"I'm YOUR mother STUPID"! It is rated PS (Pretty Stupid).