Eff Buddy Hackett -- my mom says she and my father once encountered him on a cruise ship in the hallway or something, and they tried to engage him, but he was dismissive. yes. it's an unfair assessment based on one little encounter where a non-celeb expects the celeb to be "on," but I'm taking my moms' side.
I wonder if Donovan and Al Stewart ever shared the stage? That would be one softly-spoken, affected, sibilant set!