(The hands are mine, the head and helmet ARE NOT)
I was cycling down Aloha this Tuesday (as I often do), and moved right to get further away from a passing car.
Suddenly found myself on my side on the road, presumably due to the killer pothole shown below.
I distinctly recall landing on the side of my head. My helmet was a write-off, but I had the slightest of headaches, as opposed to the extensive "road rash" elsewhere. I know about head injuries (ask me sometime), so I INSIST that you always wear your bike helmet.
Even if you don't believe me, consider the experiences of this Seattleite in Wisconsin and WEAR THAT HELMET