In Black Friday, everyone wants to get some fancy 70% off flatscreen tv. But sometimes, people can act violently. Since everything is extremely low priced, people want to buy something nice that they can afford. But most of the time, someone else wants it. This is called a competition. Usually, people shove each other and act violently. The most common form of violence is shoving/pushing.
Sometimes, people get severely injured because after they get shoved, they get pushed and trampled by others. Sometimes, people can even die! That is why some people do not like the idea of Black Friday. It can be very dangerous and violent.