FBI (First Burn the Infants).....they don’t much like that one. I tell F-troopers BATF means “Burn All Toddlers First”.....that lights them up like a firecracker, but the new agents just look at you like you are a gun-nut or patriot or something.
“Fabulous, But Incompetent” is my favorite and always makes them cringe. I’ve actually used that one a bit in real life interactions, although I will say that the FBI folks I have worked with were technical folks supporting our soldiers, not law enforcement, and were all good patriotic Americans.