- Groucho Marx: Now, Dr. Saltman, just what kind of a doctor are you: animal, vegetable, or mineral?
- Dr. Paul Saltman: Well, I am an animal, and I study plants, and I'm an associate professor at the University of Southern California.
- Groucho Marx: What's the difference between an associate professor and a full professor?
- Dr. Paul Saltman: About twenty-five hundred dollars a year.