“Never floss with a stranger.”
As quoted in Words of Wisdom (1990), ed. by W. Safire & L. Safir, p. 358
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Joan Rivers 29
American comedian, actress, and television host 1933–2014Related quotes

“Never fight fair with a stranger, boy. You'll never get out of the jungle that way.”
Ben
Death of a Salesman (1949)
Source: Arthur Miller's Death of a Salesman

“They never told you that stranger might be someone you knew.”
Source: Stay

“We never want to count on the kindness of strangers in order to meet tomorrow’s obligations.”
2008 Chairman's Letter
Letters to Shareholders (1957 - 2012)
Context: We never want to count on the kindness of strangers in order to meet tomorrow’s obligations. When forced to choose, I will not trade even a night’s sleep for the chance of extra profits.

“The image of ourselves in the minds of others is the picture of a stranger we shall never see.”
Haven (1951)

“Truth may be stranger than fiction, goes the old saw, but it is never as strange as lies.”
Or, for that matter, as true.
Source: The Areas of My Expertise (2005), p. 18

The Stranger.
Song lyrics, The Stranger (1977)