If you are ever on the London Underground and you hear a strange, obviously pre-recorded voice saying something along the lines of "Inspector Sands, please go to the operations room immediately", then be aware: what you are actually hearing is a coded message indicating to station staff that a fire alarm has been set off in one part of the station, but without panicking the stupid, sheep-like passengers. Many large public buildings such as stadia and theatres have similar messages, although the precise meaning of this one seems to depend on who you listen to.