Groucho Marx? Ethel Barrymore? Maurice Barrymore? Paul M. Potter? Gertrude Battles Lane? John Lennon? Joe E. Lewis? Robert Heinlein? Marilyn Manson? Augustus John? Oscar Wilde? Dear Quote Investigator: There is well-known and often repeated admonition directed at young people who are making too much noise: Children should be seen and not heard. Wordplay has produced …