Jay Leno's staff have become "really bitter" about what they describe as outrageous demands by Katie Couric, who will be hosting the Tonight Show on May 12th (the same day that Leno cohosts Today), the New York Post reported today (Thursday). An insider on the Leno show told the newspaper that Couric demanded that the staff book Ben Affleck, Jennifer Lopez or the entire cast of Friends for the show, and that when they were unsuccessful Couric became "really angry."