If you're watching the movie on DVD then it may be possible that your DVD player is having trouble with the audio/video sync. My DVD player always used to lag the sound track about half a second after the video causing terrible lip-sync (It was a Palsonic DVD for those who want consumer advice...DON'T buy one! It's CRAP!), thus it may also be possible that your DVD player is suffering a visual lag behind the sound track. It happens, and the only known cure for this problem is to replace your el-cheapo DVD player with a more expensive one.