You may never ever believe anything you hear again! This audio will make you have trust issues with your ears, henceforth.

This audio proves that your ears can be manipulated and tricked easily just like all other senses. Our brains have an uncanny ability to process incomprehensible information using new information.

In this experiment, audio filters are used to turn a spoken sentence into complete gibberish. That’s what your brain registers on hearing the audio for the first time. After you listen to the original unprocessed version, the brain suddenly makes sense of the gibberish version.

https://soundcloud.com/whyy-the-pulse/an-audio-illusion

This is almost similar to what happens with optical illusions. Your eyes will see only a specific image until all other details are revealed. The brain applies this same processing to things you hear but you may not have realized this until now.
[Source: www.gizmodo.com]