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I Don’t Know You From a Bar of Soap

You Know What They Say... “I Don’t Know You From a Bar of Soap.”

The earliest quotation is from the following cartoon by Stan Cross (Stanley George Cross – 1888-1977), published in Smith’s Weekly (Sydney, New South Wales) of Saturday 26th November 1938—this cartoon depicts two down-and-out men in a public park; one, sitting on a bench, says to the other, standing beside him, with a bundle under his arm:

I don’t know you from a bar of soap

The other replies:

No – I suppose we’re both strangers to you

The caption is:

SAYS HE SCORNFULLY: “I don’t know you from a bar of soap!”

However, the earliest uses of not to know — from a bar of soap that I have found date from the late 19th century, and are from U.S. publications—except two, which are from Australian newspapers.

The earliest occurrence punningly contrasts two acceptations of the noun bar; it is from The Chicago Daily Tribune (Chicago, Illinois) of Wednesday 30th May 1877—itself quoting the St. Louis Globe-Democrat1 about “the Soldene2 troup”:

The ‘prima donna’ does not know a bar of music from a bar of soap; the chief actor would not be allowed to play supernumerary in a dumb show […].”

1 I have searched in vain for the original article in the St. Louis Globe-Democrat (St. Louis, Missouri).

2 Emily Soldene (1838-1912) was an English comic-opera singer, actress-manageress, novelist and journalist.

The very same punning use of bar occurs in the St. Louis Post-Dispatch (St. Louis, Missouri) of Saturday 6th January 1883, about the last-minute cancellation of a concert by the Swedish opera singer Christina Nilsson (1843-1921):

The young men of fashion who—to use a vulgar expression—don’t know a symphony from a sardine, and could not tell a bar of music from a bar of soap, but who in deference to the dictates of fashion had bought tickets for to-night—they are not wholly unhappy and do not mourn as those who refuse to be comforted.

The phrase not to know, or not to be able to tell, a bar of music from a bar of soap has been regularly used since then.

- Pascal Tréguer



“Meaning and Origin of the Phrase 'Not to Know - from a Bar of Soap'.” Google, Google,

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