What's something weird and mostly useless that you can do with your body?
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If I press on the corners of my eye it forces air down my naso-lacrimal duct (that lets tears drain into our sinuses) and it makes a squeak loud enough for people sitting next to be to hear. I have a built in nose flute.
A nose flute, awesome! I have the opposite where I can blow air out the other way, but sometimes it will squirt out a stream of tears.