Groucho Marx Quotes
“Die, my dear? Why that's the last thing I'll do!”
Last words[citation needed]
Lord Palmerston had similar last words in 1865: "Die, my dear doctor! That's the last thing I shall do!"[citation needed]
Source: The Essential Groucho: Writings by, for, and about Groucho Marx
“Military justice is to justice what military music is to music.”
Post-Prime Ministerial
“Most young women do not welcome promiscuous advances. (Either that, or my luck's terrible.)”
Source: Memoirs Of A Mangy Lover
“Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark to read.”
This may be original with Groucho, but the Quote Investigator http://quoteinvestigator.com/category/jim-brewer/ mentions the earliest report found in a 1958 issue of Boy's Life magazine where it is attributed to Jim Brewer.
Misattributed
Variant: Outside of a dog, a book is man's best friend. Inside of a dog, it's too dark to read.
Source: The Essential Groucho: Writings For By And About Groucho Marx
As quoted in What Color is Your Paradigm: Thinking for Shaping Life and Results (2003) by Howard Edson, p. 184
Source: The Essential Groucho: Writings by, for, and about Groucho Marx
“I love my cigar too, but I take it out of my mouth once in a while.”
Source: The Essential Groucho: Writings by, for, and about Groucho Marx
“My experience is that people are most likely to listen to reason when in bed.”
Liner notes of An Evening With Groucho (1972) the recording of his appearance at Carnegie Hall.
I didn't sell any more bonds, but eh... they didn't allow me to appear anymore.
Recounting a War Bonds tour in his Carnegie Hall appearance (6 May 1972)
“I've been around so long, I knew Doris Day before she was a virgin.”
Apparently said by Oscar Levant: "I knew Doris Day before she was a virgin" (as quoted in The Wit and Wisdom of Hollywood (1972) by Max Wilk).
Misattributed
“A likely story — and probably true.”
The Al Jolson Show repartee following a trite, scripted Al Jolson joke. (1949)
On Woody Allen, in an interview with Roger Ebert in Esquire magazine (7 March 1972) http://rogerebert.suntimes.com/apps/pbcs.dll/article?AID=/19720307/PEOPLE/41116001
Just after completing his second autobiography, as quoted in The Marx Brothers: A Bio-bibliography (1987) by Wes D. Gehring, p. 137
I never said that.
Interview with Roger Ebert in Esquire magazine (7 March 1972); more on this at Snopes.com: "I Love My Cigar" http://www.snopes.com/radiotv/tv/grouchocigar.asp
Telegram to the Friar's Club of Beverly Hills to which he belonged, as recounted in Groucho and Me (1959), p. 321