Not really an example of me doing something against my common sense; this is 70% accident. But I decided to run and hurdle over a low (shin-height) chain that framed a playing field. Problem was my jump was too small, and I caught my foot on the chain.

Short story short, I landed forehead-first on concrete.

Next thing I remember I am being carried to a car. Next thing after that, being woken up by a doctor. To this day I don't know who was carrying me, how long it was between me landing and them picking me up, and how long it took to get to the doctor's. I'm not even sure what doctor it was (could've been one of two places). The third thing I remember is being home, and having a sore head. That was my final black out; been good ever since.