1.  Groucho was known for his eyebrows, his moustache, and his constant wisecracks.

2.  One of the brothers' later films was A Night in Casablanca.

3.  This film was followed by Animal Crackers, Monkey Business, and Duck Soup.

4.  He often played characters with funny names, such as Rufus T. Firefly in Duck Soup.

5.  One of their films was a version of their state play The Cocoanuts, which was written by George S. Kaufman.

6.  Harpo never spoke, so he specialized in sight gags and slapstick.

7.  Thousands of theatergoers, however, knew them as Chico, Harpo, Groucho, Gummo, and Zeppo.

8.  Every film was a whirlwind of hilarity, with nonstop jokes and physical comedy.