Comment by alain_gilbert

I know it sounds crazy, but my refrigerator beam some whistle alike sounds. If I move my head like one foot beside I don't hear the sound, but one foot on the other side and I hear the whistle.

Edit: I have a video of it, it's not as clear in the video as it is in real life though. You have to put volume at 100%.(https://www.dropbox.com/s/7h7n46kzqarzt0l/fridge.mp4?dl=0)