The famous phrase "Well, who you gonna believe, me or your own eyes?" is often referred to as a Groucho quote, but it was actually delivered by Chicolini (Chico Marx) in Duck Soup (1933) while impersonating Rufus T. Firefly (Groucho).
Grandfather of actress Jade Marx-Berti.
Was never much of a womanizer in real life (as were his older brother, Chico Marx & Harpo Marx), having joked later in life about his disastrous attempts at courting as a young man.
Appears on a 44¢ USA commemorative postage stamp, issued 11 August 2009, in the Early TV Memories issue honoring You Bet Your Life (1950).
Shortly after his death, his children found a gag letter written by Groucho that stated that he wanted to be buried on top of Marilyn Monroe.