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I would swear I watched him (on tv) being led to and from the mic on stage as if he were blind.
I must have been dreaming.
I also vividly recall him appearing on a UK tv show such as Pebble Mill at One and totally missing his cue to start singing (miming) - not his fault, there were technical problems and he couldn't hear the music. He thought it very funny and they all had a good laugh.
I must have dreamt that, too, because he died in 1988 and I thought the show aired much later than that.