When the news broke of the tragic passing on 28 October of the comedy actor, and everyone's sarcastic favourite in Friends, Matthew Perry (right), the tributes didn't focus solely on his talents for making people laugh. Featured prominently in the obituaries were his struggles with mental health and addictions to alcohol and painkillers, something the man himself would undoubtedly have approved of given his openness on the subject.
Perry wasn't unique in this. Many comedy icons – Robin Williams and Spike