“When you call me that, smile!”
The Virginian (1902), pp. 29–30. Reported in Respectfully Quoted: A Dictionary of Quotations (1989), as presumably the forerunner of "Smile when you say that, partner".
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Owen Wister 5
American writer 1860–1938Related quotes

“When they see us dance. When they see how you look at me. When they see how I smile at you.”
Source: The Other Boleyn Girl

Joe Strummer / Mick Jones, "London Calling", London Calling (1979).
Lyrics

“Usually when Geoff punches me, he's smiling. There was no smiles. It was pure rage.”
"Let's Play Minecraft Part 9 - Build a Tower Part 2" https://www.youtube.com/watch?v=WpfWIizrd6U. youtube.com. July 27, 2012. Retrieved May 4, 2014.

“I'm in heaven, I'm in heaven
I'm in heaven when you smile, when you smile.”
Jackie Wilson Said (I'm in Heaven When You Smile)
Song lyrics, Saint Dominic's Preview (1972)
Source: Tatiana and Alexander

“You've got a face for a smile, you know
A shame you waste it when you're breaking me slowly.”
World Of Chances
Lyrics, Here We Go Again (2009)