This is why you should ALWAYS wear a helmet when you are on your bike.
People who know me know that I never go anywhere on my bike without my helmet - except for last night when I biked to the end of my alleyway, hit a speedbump, lost control and smashed my face into the asphalt.
Idiot.
I have gotten into discussions with helmetless cyclists who say the helmet won't protect them from collisions. Yes, but the real reason to wear a helmet is to protect your head from minor cockups like mine last night.