No known citation to Marx. First appears unattributed in mid-1960s logic/computing texts as an example of the difficulty of machine parsing of ambiguous statements. Google Books. The Yale Book of Quotations (2006) dates the attribution to Marx to a 9 July 1982 net.jokes post on Usenet, although it has not been possible to locate a matching post in the Google Groups archives.
More quotes by Groucho Marx
My experience is that people are most likely to listen to reason when in bed.
Remember, you're fighting for this woman's honor, which is probably more than she ever did.
No one is completely unhappy at the failure of his best friend.
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A generation which ignores history has no past —and no future.
Nothing is there to come, and nothing past,
But an eternal now does always last.
Attribution
Quote text and notes from Wikiquote: Groucho Marx (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.