“Diplomacy is the art of saying nice doggy until you can find a rock. ”
“Diplomacy is the same as saying "nice doggie" until you have a chance to pick up a rock.”
Attributed to Francis Rodman, in volume 64 of The Reader's digest (1954)
Other variants also attributed to Wynn Catlin in Kiss Me Hardy : Quotations Ancient and (Very) Modern (1982) by Roger Kilroy; and to Winston Churchill by Dick Applegate in a speech reprinted in Volume 75 of "The Carpenter" (1955)
Misattributed
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Will Rogers 121
American humorist and entertainer 1879–1935Related quotes

Interviewed by J. Michael Straczynski Clue book for the computer version of I Have No Mouth, and I Must Scream http://infidels.org/kiosk/author/harlan-ellison-207.html

“The essence of what you have to say you pick up before you're twenty.”
In The Making (1970)

“I'm not picking up dog shit. I'm a rock star.”
The Osbournes television show

Press conference http://www.findarticles.com/p/articles/mi_m1309/is_1_35/ai_54259243 regarding the use of force to gain compliance from Saddam Hussein (24 February 1998)

“Take these chances
Place them in a box until a quieter time
Lights down, you up and die.”
Ants Marching
Remember Two Things (1993)

“Life is not fair. Get used to it… Be nice to nerds. Chances are you'll end up working for one.”
Though widely attributed to Gates on the internet, this list of life suggestions is actually based on one from Charles J. Sykes. More information at Snopes.com http://www.snopes.com/language/document/liferule.htm
Misattributed

“You have to pick yourself up from where you fell.”
Chang Ching-sen (2018) cited in " Taichung to host first Asia-Pacific Youth Games in 2019: mayor http://focustaiwan.tw/news/aipl/201809030021.aspx" on Focus Taiwan, 7 March 2018.