My most memorable head injury was my figure skating accident back in the spring of 2003.  Can't say I was even doing anything cool.  Edge drills - had literally just pushed off, lost my balance, decided to break the fall with the back of my head and neck in one large crack.  Ended up with concussion and neck sprain.  Went back to skating 7 days later, as soon as I was allowed!  They told me I should wear a helmet - I said no way in hell.  I wasn't going to be the only 22 year old on the ice with a helmet along with the 3 year olds! hahaha

Hard headed and proud of it. 

Two really bad one's put in the hospital for a quick stitch-up and pain meds, no CT scanners near us back then.

Then the one's as a kid, I call them the "knock-outs" from bicycle's, no helmets back then either, stepping on a rake (that one was classic) and so on.

Often thought it was one of those hard hits to the head that was what caused my "crippling headaches". I know different now.