(An article written by Dr. C.R. Swaminathan, former Deputy Educational advisor to Govt. of India given to a souvenir. Here is a gist of the article.)
This happened in the year 1956-57, when H.H. Sri Kanchi Mahaswamigal was camping at the Madras Sanskrit College, Mylapore, Madras. One evening, Mahaswamigal was about to address a huge gathering in which great personalities like Rajaji were present. He was contemplating about the topic he should speak on. Suddenly, he called late Prof. Sankaranarayana Iyer, who was standing by the side of the dais and recited two lines of a Sanskrit verse. He asked the Professor if he remembered the remaining two lines of that verse. The Professor pleaded ignorance and got down from the dais.