Why?

In third grade I would accidentally hit my head on the wall and my friends would tell me I lose brain cells by doing that. I guess that means I should be dumb as a well really dumb person.
A map has fallen on my head (I guess it was trying to drop some knowledge on me), I have been knocked out by a 4th grade football player, I have hit my head countless times on the monkey bars, I have been hit in the head by a football, volleyballs and a door. But none of them have hurt as bad as today. When dad accidentally hit me in the head with a metal light stand.
Lucky me.