Ouch!

I was moving quickly, enjoying the crispness in the air, looking at the changing colors, walking.

And then... ouch! An acorn came flying out of a tree, connecting sharply with the center of my head. Did I say ouch!? It's hard to imagine the impact of something as small as an acorn falling (a fairly long distance). Do you suppose one of those crazy red squirrels saw me coming and took careful aim?