(AP) — Dustin Diamond, the actor who portrayed Screech on the 1990s TV show "Saved by the Bell," went on trial Wednesday on charges that he stabbed a man during a confrontation at a bar, but the proceedings came to a screeching halt at the start after the prosecutor objected to a defense attorney's good luck message for his client. Diamond, 38, is charged with a felony count of second-degree recklessly endangering safety and two misdemeanors — disorderly conduct and carrying a concealed weapon. Testimony on Wednesday focused on the tavern's murky surveillance video, which doesn't show the stabbing.