There are times in life where you do not think of your actions before going through with them. The action seemed like a good idea at the time, doing it out of impulse or to impress bystanders. This may be known as indirect peer pressure, where you get the urge to get dumb things to impress people. It is an effect most commonly seen when trying to impress females.
Despite thinking it was cool at the time, some actions can carry dire consequences. For example, doing an action that may result in serious injury to another individual. If such a thing results in severe injury or even death, you can be sure the life of the perpetrator will pretty much be over.