“I was feeding cannabis-laced brownies to the seabirds. No tern was left unstoned”

“No stone left unturned” is a popular idiom. “No tern left unstoned” is a spoonerism.
   
“The professional punster leaves no phrase unturned as in the case of him who said of the little boy that kept throwing rocks at gulls, ‘He left no tern unstoned’” was printed in the Atlanta (GA) Constitution on March 9, 1953. “THERE WERE NO TERNS LEFT UNSTONED” was printed in a comic strip in the Tampa (FL) Times on April 11, 1975.
 
“Went the coast and fed the seabirds some cannabis laced brownies. No Tern was left unstoned” was posted on Twitter by Robert Wilkinson on July 28, 2020. “Spent the afternoon at the beach feeding cannabis laced brownies to the seabirds. No tern was left unstoned” was posted on Twitter by Robert Wilkinson on September 19, 2020.
     
“The butcher who made seabird sausages took a tern for the wurst” is another “tern”/“turn” pun.
       
   
Newspapers.com
9 March 1953, Atlanta (GA) Constitution, “No Tern Was Left Unstoned” by Leo Aikman, pg. 4, col. 6:
The professional punster leaves no phrase unturned as in the case of him who said of the little boy that kept throwing rocks at gulls, “He left no tern unstoned.”
     
Newspapers.com
11 April 1975, Tampa (FL) Times, “Conchy” comic strip by James Childress, pg. (-C, col. 1:
THERE WERE NO TERNS LEFT UNSTONED.
 
The Comics Section
SUNDAY, SEPTEMBER 13, 2009
Mother Goose and Grimm: There was no tern left unstoned.
(The comic strip is also here, on Newspapers.com.—ed.
This pun deserves props. In general, Mike Peters makes pretty good use of the much maligned play on words, and is probably second only to Stephan Pastis as the pun master of the comics section.
POSTED BY JUSTIN AT 10:33 AM
LABELS: MOTHER GOOSE AND GRIMM, PUNS
   
Twitter
Robert Wilkinson
@robertwlk
Went the coast and fed the seabirds some cannabis laced brownies.
No Tern was left unstoned
6:39 AM · Jul 28, 2020·Twitter for Android
   
Twitter
David John Jones
@jonesdave208
Went to the coast and fed the seabirds some cannabis-laced brownies.
No Tern was left unstoned.
4:49 PM · Jul 29, 2020·Twitter Web App
   
Twitter
Robert Wilkinson
@robertwlk
Spent the afternoon at the beach feeding cannabis laced brownies to the seabirds.
No tern was left unstoned.
12:43 PM · Sep 19, 2020·Twitter for Android
 
Twitter
The Dad Joke Man
@DadJokeMan
I spent the afternoon down at the beach feeding cannabis laced brownies to the seabirds.
No tern was left unstoned.
4:06 PM · Oct 7, 2020·Twitter for iPhone