Answer
Enter Laughing is a 1967 film starring Walter Matthau, Maureen Stapleton, Robert Morse, Anne Jackson, and Don Rickles. The film is based on the 1964 novel of the same name by Joseph Heller. It tells the story of a young man who tries to make it as a comedian in New York City. Rickles plays the role of a comedy club owner who gives the young man his big break.