The answer is Elisha Cook Jr! In an office I worked for in the 1970s I used to ask a movie question which would frustrate everybody until I told them the answer, but for the life of me I cannot remember the question I would ask. It has frustrated me for many years. If anyone can help I would be extremely grateful. What was the question? I know Elisha Cook Jr appeared in The Big Sleep. This is the only time I think I have seen Elisha Cook Jr so this may be a help or a red herring. Happy hunting. Keep safe.