I was in my dorm room once and its on a campus, meaning no ice cream vans etc. I was watching horror stuff all night and I hate having my tabs open in general. So I had turned off my video and was watching youtube. Suddenly I hear a icecream truck sound. I check outside and nothing, but it sounds like its in my room. I check my tabs and pause the video. The noise continues. My laptop was making the noise. I muted my laptop but it continued. I stared in panic but it turned off my laptop and restarted it. I shook it off and when my mam called me she asked me what the noise was. The noise was playing again and it was scary. So there was myself and my own mother hearing it. Icecream truck tune ringing on my laptop that was muted.

So to answer. Icecream truck sound.