Benny Rubin (February 2, 1899 – July 15, 1986) was an American comedian and film actor. Born in Boston, Massachusetts, Rubin made more than 200 radio, film and television appearances over a span of 50 years. Radio and television Rubin was known for his ability to imitate many dialects, as was evident when he was a panelist on the joke-telling radio series, Stop Me If You've Heard This One. He made frequent guest appearances on both the radio and television versions of The Jack Benny Program. A popular bit included Jack asking a series of questions that Rubin would answer with an ever-increasing irritated, "I don't know!" followed by the punchline. Books Jokes by Lew Lehr, Cal Tinney, Roger Bower and Rubin were collected in Stop Me If You've Heard This One, a 1949 Permabook published by Garden City Publishing. Permabooks were designed with an unusual format of a paperback bound with stiff cardboard covers (with a "special wear-resistant finish") to simulate the look and feel of a hardcover book, and the company had previously published Best Jokes for All Occasions, edited by Powers Moulton. The Stop Me If You've Heard This One Permabook featured a two-page foreword by Tinney, a one-page introduction by Bower, 66 pages of jokes by Bower, 85 pages of jokes by Tinney and 82 pages of jokes by Lehr. Under the heading, "P.S.", Rubin only had space for four jokes on two pages, as explained, "Benny Rubin was added to our show just before press time." Rubin (far left) plays eccentric Professor A.K. Rimple in the Three Stooges short Space Ship Sappy. In 1980, Rubin published his autobiography, Come Backstage with Me. Rubin died of a heart attack in Los Angeles, California on July 15, 1986.