Want to see a dinosaur become extinct right before your eyes? Get your remote control ready while watching Jurassic Park (1993, MCA/Universal) on videotape or, better yet, crystal-clear laserdisc. An hour and 58 minutes into the movie just as the Tyrannosaurus rex chomps down on a velociraptor threatening Sam Neill, Laura Dern, and the kids in the lobby of the theme park's visitor center hit the freeze button, and go through the scene frame by frame. You'll see that for one brief instant the raptor disappears from the T. rex's jaws apparently the fault of one of the computer-animation wizards at Industrial Light and Magic. The raptor returns in the very next frame to resume its role as dino food.