Comment by cantrevealname

Some decades ago there was an actual product you could buy that did the analog version of this service. It was a cassette tape with various background noises, so you could call your boss or spouse from a payphone and play background noise from (for example) a car mechanic’s shop while you explained that you’re not coming because your car broke down. The auto repair recording had a convincing mix of clanging, hammering, and car engine sounds, but there were a dozen other scenarios to choose from on the tape.