“The quote "Some people are born on third base and go through life thinking they hit a triple," is often attributed to Switzer but, in fact, appeared in print five years before the interview in which he is known to have said it. Ralph Keyes, author of The Quote Verifier: Who Said What, Where, and When, attributes the quote to to an unknown author following an investigation in his book.”
[The Unknown Barry Switzer - Poverty, Tragedy Build Oklahoma Coach into a Winner, Tom Shatel, December 14, 1986, Chicago Tribune, http://www.chicagotribune.com/news/ct-xpm-1986-12-14-8604030680-story.html, October 1, 2018]
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Barry Switzer 2
American football player and coach 1937Related quotes
Source: Peter's Quotations: Ideas for Our Time (1977), p. 418

Source: Adventures In The Screen Trade: A Personal View of Hollywood

Quando mi viene in mente un bell'aforisma, lo metto in conto a Montesquieu, od a La Rochefoucauld. Non si sono mai lamentati.
cited in Mai dette, ma le ripetiamo sempre Ecco le frasi fantasma della storia http://www.ilgiornale.it/news/mai-dette-ripetiamo-sempre-ecco-frasi-fantasma-storia.html by Luigi Mascheroni, in il Giornale, 21 March 2009, p. 22.
2000s - 2010s

Chrysippus, 3.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 7: The Stoics

“He was born on third base and thought he hit a triple. [about George Bush, Sr. ]”
about George Bush, Sr. Earlier use by Barry Switzer<ref name="kcstar">[Tom, Shatel, http://articles.chicagotribune.com/1986-12-14/sports/8604030680_1_big-eight-coach-aren-t-many-coaches-oklahoma, The Unknown Barry Switzer, Kansas City Star and Times, December 14, 1986, 2012-04-05]
Misattributed

Source: 2004, How to Talk to a Liberal (If You Must) (2004), p. 66.

The Museum of Curiosity (BBC Radio 4, 2008)

“I made the statement years ago which is often quoted that 80 percent of life is showing up.”
People used to always say to me that they wanted to write a play, they wanted to write a movie, they wanted to write a novel, and the couple of people that did it were 80 percent of the way to having something happen. All the other people struck out without ever getting that pack. They couldn’t do it, that’s why they don’t accomplish a thing, they don’t do the thing, so once you do it, if you actually write your film script, or write your novel, you are more than half way towards something good happening. So that I was say [sic] my biggest life lesson that has worked. All others have failed me.
Interview for The Collider (2008) http://collider.com/entertainment/interviews/article.asp/aid/8878/tcid/1/pg/2.