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I think Robin Williams had a little something extra going on. He had some degenerative brain condition that was worsening as he got older. I'd have to check the interwebs, but it wasn't something that he shared publicly.
EDIT:
Here it is https://en.wikipedia.org/wiki/Dementia_with_Lewy_bodies
Stone sour did a killer job on there tribute last night. Love Corey Taylor and the respect he gives