This sound could be a lot of different things but what it turned out to be was about the last thing anyone could come up with! See if you can figure it out. The spoiler is below!
The cassette turns 50 this month. September of 1963 brought new uses for the Bic pen. Remember rewinding the tape if it was pulled out off of the spool with a pen? Cassettes were (and still can be if you have the right equipment) a great way to play back instant recordings.