What's something weird and mostly useless that you can do with your body?

Never heard this, interesting. I usually only hear it in places with low background noise, it kinda reminds me of the sound a CRT TV or something kinda like electricity, it's not really like those things, but it's the closest thing I can think of.

I can also hear myself blink if I have silence in a room.

I also actually do have a thyroid condition, but that could be pure coincidence.