Avrum was there in the audience, I believe, in Berkeley on the afternoon in 1941 when, in conformity with the law subsequently enunciated by Murphy, what could go wrong, epistemologically, did. G.E. Moore was delivering the Howison Lecture in Wheeler Auditorium, which had a handsome coffered ceiling inset with glass panels. Giving a local angle to his defence of common sense, Moore declared that among the things he knew there and then was that light from the sun was streaming through the roof. Most in the audience were aware, however, that the glass panels were diffusers for electrical illumination; the roof of the building was solid and opaque. Someone had the temerity to point this out to Moore in the question period. He responded, "Oh dear me!" and went on to the next question.