I’ve heard an old story of someone who needed their leg amputated. They took a marker and wrote on the right leg: “Take this one”.
In the operating room, the surgeon exposed the left leg and started sawing. Never paid attention to the right leg — why bother? The Doc was sure the left leg was the problem ... so he just got to work.
The correct think would have been to write “NOT THIS ONE” on the good leg.
The doctors might not have even seen the bad leg with the text written on it, if it was draped.
Did something similar when the VA was going to do surgery on my eye. Had a friend “Sharpie” a “Y” on one eyelid and a “N” on the other.