My family doesn't believe me, but

I was biking this morning along the West River Road when from above I heard something that sounded like a rodent war cry. Kind of a high pitched "heeeeee yaw!". And then an acorn cracked off my helmet so hard that there is no way it could have just been gravity that propelled it. Believe me, they are out there and they are armed. Squirrels that is. I strongly recommend going out of doors only if helmeted.