Phantom of the Megaplex (movie, 2000)

Pete Riley is a 17-year-old who lands a part-time job at a multiplex in his neighbourhood. He and his friends are excited when it's announced that the theatre will play host to the premier of a major motion picture, with a number of Hollywood celebrities in attendance. However, when the big night comes, Pete has to contend with disappearing staff, malfunctioning equipment, and a broken popcorn machine.