Like a child stumbling upon the Dead Sea Scrolls and scientists using all of our modern technology to restore them and uncover their meaning, some tech-savvy Popeye fan recent discovered that if you slow down the audio of the cartoon mouse in the above clip, you get a secret (albeit irrelevant) message.
Using scrap audio for these kinds of things was probably pretty common, and with the ability to slow audio down now easily within the grasp of anyone who owns a computer, who knows what else we'll find.
Did you known the Road Runner's "beep beep" when slowed down actually transmitted information to troops fighting in the Korean War?
Oh, you didn't? It's because I made sh*t that up.