Quadcopter crash–flying without a prop nut00:35

I was flying today and out of nowhere I fell out of the sky. When I took off my goggles I saw a propeller falling carelessly from the sky. When I picked up the propeller it was totally fine; I had expected it to be just a fragment since I use self tightening propeller nuts and there is no way it should have been able to fly off in once piece. Anyways, after I reviewed the video it became obvious that the prop nut had flown off. I have no idea how this happened, it really should not have been possible.

Anyways, nothing was damaged, so I’ll live to fly another day.

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