Thanks, KidCycle, I'm over it. Last fall it was a bag of JackIntheBox leavings that bounced off the rear of my helmet. Many drivers I encounter are courteous, are obviously conscious of driving carefully near a cyclist. Others are indifferent or oblivious. I suspect some are a little envious or feeling a bit guilty ("I gotta get more exercise"). Hopefully, even obnoxious teenagers grow up. Come to think of it, my two did!