R.E.M guitarist Peter Buck was back on trial in a London courtroom Monday to face charges of assaulting a British Airways flight crew during a Seattle-to-London flight last April. Prosecutors said Buck — whose first trial was dismissed on a technicality — behaved like a "drunken lout," overturning a breakfast trolley, mistaking a stranger for his wife and scuffling with crew members. The 45-year-old guitarist has pleaded not guilty.