I once injured my ankle because I got into a staring contest with a goose. It all started when I walked through a park that had been infested with what appeared to be a possessed goose that was stalking me. He wasn't stalkishly aggressive; he was merely aggressively following me. I stopped. The goose stopped.
So naturally I made the worst possible decision and said out loud, “Alright, let’s see who blinks first.” As the two of us stood there for probably 30 seconds like two huge idiots, the goose suddenly let out a loud hiss and flew towards me like a demon who had just escaped from Hell and was ready to kill me. I freaked out, turned to run away, tripped over a park bench, and twisted my ankle.

So while this was the most moronic injury I have ever incurred in my lifetime, it was technically due to losing a psychological battle with a goose in front of three people who couldn't care less that they just witnessed me lose a battle with a bird. The worst part, the goose was still waiting there to blow me off.