Well, in particular, the sound of rhubarb growing. Yes, you can hear it grow. At least when it is grown in the dark.
My dear spouse Mary found this link. You have to check it out. Firstly, because the sounds are very cool. And secondly, because it is NOT a sound/noise to complain about. Most of us will never have the chance to hear it in real life. So enjoy the video, and the story.