"I didn't think wearing orthopaedic shoes would…

“I didn’t think wearing orthopaedic shoes would help my posture,” an old joke goes, “but now I stand corrected.” The joke has been told several times by television personality and author Steve Allen (1921-2000), who wrote in Schmock-Schmock! (1975):

SARAH: Very well. I stand corrected.
ROY: Well, you should. You’re wearing orthopedic shoes.

Wikipedia: Steve Allen
Stephen Valentine Patrick William “Steve” Allen (December 26, 1921 – October 30, 2000) was an American television personality, musician, composer, actor, comedian, and writer. Though he got his start in radio, Allen is best known for his television career. He first gained national attention as a guest host on Arthur Godfrey’s Talent Scouts. He graduated to become the first host of The Tonight Show, where he was instrumental in innovating the concept of the television talk show. Thereafter, he hosted numerous game and variety shows, including The Steve Allen Show, I’ve Got a Secret, and The New Steve Allen Show, and was a regular panel member on CBS’ What’s My Line?

Google Books
Schmock-Schmock!
By Steve Allen
Garden City, NY: Doubleday
1975
Pg. 151:
SARAH: Very well. I stand corrected.
ROY: Well, you should. You’re wearing orthopedic shoes.

Google Books
Good Help is Hard to Find:
A Play in One Act
By Arthur L. Kopit
New York, NY: Samuel French, Inc.
1982
Pg. 15:
FANNY. (...) I stand corrected.
JILLIAN. You wear orthopedic shoes?

Google News Archive
5 October 1991, Pittsburgh (PA) Post-Gazette, “Steve Allen opens Pops with wit and nostalgia” by Mark Kanny, pg. 37, col. 4:
Most of Allen’s wit was self-deprecatory. When reminded by conductor Barbara Yahr that he was skipping a selection in announcing the next piece, he said, “I stand corrected, as I should be — I’m wearing orthopedic shoes.”

Google Groups: soc.support.transgendered
Major Contradiction.
Gwendolyn Ann Smith
12/28/99
(...)
Does “standing corrected” require orthopedic shoes?

Google Groups: alt.music.steely-dan
A little background on WSB
John Duffy
7/15/00
(...)
Like the man in the orthopaedic shoes…. I stand corrected!

Google Books
Seriously Funny:
The Rebel Comedians of the 1950s and 1960s
By Gerald Nachman
New York, NY: Pantheon Books
2003
Pg. 152:
His (Steve Allen—ed.) ad-lib talent, innate sense of the ridiculous, and an obsessive love of wordplay (“I stand corrected — and I should because I’m wearing orthopedic shoes”) gave him a huge head start on most stand-up comics, and everybody else then on television.

Twitter
Evo Terra’s stuff
‏@evo_terra
As the man said in his orthopedic shoes, ‘I stand corrected’. Local dive has Kiltlifter.
10:18 PM - 28 Apr 2007

Google Books
The Mammoth Book of One-Liners
By Geoff Tibballs
London: Constable & Robinson Ltd.
2012
Pg. ?:
“I stand corrected,” said the man in the orthopaedic shoes.

Twitter
andy cope
‏@beingbrilliant
I didn’t think wearing orthopaedic shoes would help my posture. But now I stand corrected
#JokeOfTheDay
1:40 AM - 8 Aug 2015

“I didn’t think wearing orthopaedic shoes would help my posture, but now I stand corrected”