Like “does the Pope shit in the woods?” or “that train has sailed?”
Also, what good examples can you think of?
Does a bear shit in the Pope’s hat?
“I could care less”
Get two birds stoned at once
I like, “get two birds stoned with one bush” as some bastard amalgamation of “kill two birds with one stone” and “a bird in the hand is worth two in the bush”
“The blood of the covenant is thicker than the water of the womb.” Meaning contracts, friendships, and keeping promises should take priority over family loyalty.
Now changed to “Blood is thicker than water” and means the exact opposite of the original.
How the hell should I know, I’m not a rocket surgeon
Now, that one does have its place. I either it in an ironic sense that you dont need multiple degrees to do something. The flip side is that the people we send to space tend to be the most qualified people in multiple fields, a medical surgeon with a stem degree does not sound too far outside the realm of reason.
Arguably, a mechanic who is literally performing maintenance on exceptionally mechanically dense and complex parts of a rocket, say the rocket engine plumbing or wiring harnesses… is figuratively performing rocket surgery.
Or, taking a different perspective:
https://pubmed.ncbi.nlm.nih.gov/1433409/
Management of trauma and emergency surgery in space
As on Earth, the major determinant of emergency surgical care in spaceflight may be the presence or absence of a well-trained surgeon.
Sounds like they need a rocket surgeon!