The Sunshine Boys is a 1975 American comedy film directed by Herbert Ross and produced by Ray Stark, released by Metro-Goldwyn-Mayer and based on the play of the same name by Neil Simon, about two legendary (and cranky) comics brought together for a reunion and revival of their famous act. The cast included real-life experienced vaudevillian actor George Burns as Lewis, Walter Matthau as Clark, and Richard Benjamin as Ben, with Lee Meredith, F. Murray Abraham, Rosetta LeNoire, Howard Hesseman, and Ron Rifkin in supporting roles. This would be Matthau's last Neil Simon movie until 1982's I Ought to Be in Pictures with Ann-Margret and Dinah Manoff. Wikipedia
Willy Clark: Come in... and *enter*!