Picture this. You finally close the stream. You're finally free from hearing the Boo stamp over and over again. Then, there's a noise. "Waah!" Was that a hallucination? Was it a sound coming from the video you have on the second monitor. Then, it happens again. "Waah!" That noise. Again and again, it teases your ears at the fringes of hearable sound. "Waah. Waah. Waah."
You heard the sound for so long that it's been carved into your brain. You keep hearing it over and over, even after the stream is turned off. Death is the only escape. Waah.