(This happened about 15 years ago to my father-in-law, who worked at the time for the anti-trust division of the justice department.)
The justice department was trying a case against a company in New York, who had engaged the senior partner of the biggest law firm there, Alan Dean, to defend them. My father-in-law represented the Justice department.
There was a LOT of evidence and each side had their own idea about how to refer to the exhibits. My father in law went by the school of 1A, 1B, 1C, 2A, 2B etc, while Alan Dean went by A, AA, B, BB, BBB, C.
At one point, well into the trial, a piece of evidence for the defense was labeled "PPPP." The judge was about half asleep but this reference caught his attention.
Judge: Mr. Dean, what number was that exhibit?
Alan Dean: Pee pee pee pee your honour.
(the courtroom and judge giggles, every time pee pee pee pee is mentioned)
Judge: (smirk) Mr. Dean, please abbreviate your exhibit names from, for example, pee pee pee pee to 4P's.
AD: Yes your honour. I'd like to display the next piece of evidence.
Judge: What number would that be, Mr. Dean?
AD: 4Q, your honour.