Have you ever been in a situation where you're driving along in your car and somewhere out of the corner of your eye you see someone fall off bike, sprain an ankle, or get in a car crash? Odds are that at one point most of us have, but the question which is interesting to investigate is, "Would you stop to help?" According to the idea that the bystander effect presents our willingness to the help the person would depend on how many other people we saw near the situation. So if we were driving past a park full of people, when we saw this person hurt themselves, odds are that the majority of us would not help them. The reason this happens is because many people have the idea in there head that, "Oh someone else is here, therefore they will be able to help him and I won't." However because everyone thinks this at the same time sometimes the person who is in need of help often does not receive any!
Another real life situation of the bystander effect was a time a young girl was abducted and because there were many people around no one chose to help. This can be viewed in the following video:
http://www.youtube.com/watch?v=KIvGIwLcIuw
Overall, it is scary to think that if we were experiencing an emergency in an area with 10 people instead or by 1 person alone, we would less likely be helped in the situation with 10.
What would you do?

I also found it very interesting like you did, that when the number of people increases in the area where a crime is taking place, the less likely it is for someone to help the victim, etc. I am not sure if you if have a hard time believing this like I do. I have a hard time believing this due to the example of 9/11. It seemed on that day, everyone was helping people out no matter what the others situation was such as helping those who were physically hurt from the towers falling, people who were walking by were consoling each other, etc.It was an collaborative effort that the numerous people standing around, all participated in someway or another and in New York there are numerous people with in one square block radius. So in reality it may not be that people don't want to help because there are lots of other people around it may be the severity and time of day that will impact if people will help or not.