Billy Bob Thornton has hit another low note in Canada. The actor-turned-singer, 53 -- who got testy during a Canadian radio interview earlier this week -- was booed while performing with his band, the Boxmasters, Thursday night. "It seems as if when I say something it's in the news," he told the crowd, referring to his bizarre interview, during which he cursed at the host and referred to Canadian audiences as "mashed potatoes with no gravy." The audience immediately began booing, ...