High school graduation is supposed to be a time when you take pride in your accomplishments, give thanks that the torturous four years of high school are finally over, and celebrate moving on to bigger and better things. However, things didn't go as planned for the teens on this list. All of these people died at their high school graduation, or shortly before or after it.Not surprisingly, many of these are car accidents. Vehicular accidents are the number one cause of death for teenagers, and they happen most frequently during prom and graduation season. These stories of people who died at graduation will make you realize that you should never take life for granted.