People News Charlie Sheen tackles notion that he's bipolar in Toronto appearance 04/16/2011 Charlie Sheen scoffed at the notion of being bipolar during an impromptu benefit walk for the disorder prior to his one-man stage show in Toronto. Read More RELATED NEWS Jimmy Fallon's 'The Tonight Show' dropping to only four nights a weekAshley Tisdale announces birth of her second childSelena Gomez is a billionaire TAGS: Charlie Sheen