Anecdotes
One afternoon, an FBI agent went in, and the counter boy was new, and he served up a wimpy little roast beef sandwich with barely any meat on it at all. The agent got so incensed that he pounded on the table and screamed "FBI! MORE ROAST BEEF!" Since that time, showing someone your credentials has become known as 'roast beef'ing the subject.
This of course never happened. Kessler tracked down the agent who supposedly did this thing, and was told A) he never said he was from the FBI, someone else in the deli did, half-jokingly, B) there was plenty of meat on the sandwich, it just wasn't very lean, and C) it was corned beef.
Take me
back to the FBI-SAD Page.