From 1988 to 1999, the TV show Mystery Science Theater 3000 defined a comedic genre of making fun of bad movies in real time. But after the show went off the air, its creators found a new outlet for their "riffing," one that allowed them to expand their repertoire from old sci-fi B-movies to current Hollywood blockbusters. Their company RiffTrax offers MP3 audio files that users can download and play along with a rented DVD. Bob asks RiffTrax's Kevin Murphy and Bill Corbett for some pointers in preparation for OTM's impending revival of Media Scrutiny Theater.