The same thing happened to me a couple of years ago... a man that lived on the third floor next to me tumbled down three flights of stairs and 'spider-webbed' his skull. He was intoxicated, and from the sound of his so-called friends at the time, under the influence of other things as well. (I should mention that this man was unconcsious, not breathing and there was blood everywhere... his 'friends' were screaming, "Go get the detox!") Later I learned I was the only person who called 911 and the first aide I administered made the difference between life and death.
Even after I saved that man's life he STILL never spoke to me. Some people out there, huh? Great story!