Best known as the drunken, unseen doorman Carlton on Rhoda (1974) and as the
voice of Garfield on TV -- both voice roles.
Never being seen on Rhoda (1974) as Carlton the doorman - and becoming
well-known for it - gave him the idea of never being photographed
directly in public or on film. Either he'd have something blocking his
face, or he'd only be seen in silhouette.