You were having a peaceful alone time in your room while your parents were greeting some guests downstairs. You were listening to music and drinking coffee, really peacefully. Just before you hear loud laughters coming from downstairs, ruining your peaceful silence...

Then, you rise the volume coming from your headphones, just to hear the music better and surpress the noise coming from downstairs. You made a mistake. Now, you couldn't hear anything, not even the knock coming from your window. You were upstairs, but there was still a knock on your window, which you couldn't notice at all...