Last week, a friend of mine suffered a concussion from a hit-and-run accident in which a bicyclist knocked my friend over. The accident occurred on one of the walking paths near central campus. The cyclist saw that my friend, who had hit her head on the sidewalk, was unconscious. When my friend regained consciousness, the cyclist asked her if she was OK before getting back on their bike and riding off without offering to call for help or even giving my friend their name or contact information.