panic. This code word was used in the Manchester Arena bombing and is used in the majority of British transport locations. The code word is usually used in the context: "Would Inspector Sands please report to the operations room immediately." Some stores have special codes that allow one employee to inform another that a certain customer in the store needs to be watched because they are acting in a suspicious manner similar to the typical behavior of a shoplifter. Movie theater employees may say, "Mr. Johnson is in theater number three" to indicate that there is a fire or smoke in that theater. Nightclubs and bars often use the name "Mr. Sands". Many taxi drivers use radio codes like, "There's an oil spill at ...", or "Cardboard boxes lying on the road ...", to warn other drivers of a police speed detection unit. There are other codes to tell other drivers that a popular taxi rank is empty (or full), or warn of drunk or obnoxious customers trying to hail a taxi. "There's a number eight at the railway station," might mean beware of a fare who looks likely to throw up in your taxi. Schools will sometimes use codes during intercom announcements for situations that might distract students (such as an early dismissal due to weather). The Drug Enforcement Administration reported in July 2018 a total of 353 different code words used for cannabis. Code words are used extensively within the illegal drug trade to hide drug trafficking activities from the uninitiated. Some "code words" are fictitious. In the Sherlock TV series, "Vatican cameos" is used between John Watson and Sherlock Holmes as a code word, initially meaning simply 'duck' or 'get ready.' Various internet sources offer an erroneous etymology for the phrase, suggesting it dates to World War II. It is, in fact, an allusion to an unpublished case investigated by Holmes in the canonical short story "The Hound of the Baskervilles". Informal code words and propaganda An informal code word is a term used without formal or prior agreement to communicate to a subset of listeners or readers predisposed to see its double meaning. Informal code words can find use in propaganda, distinct from use of euphemistic code words to delay or avoid emotional responses in the audience. They may be intended to be construed as generalized platitudes by the majority of listeners, but as quite specific