A lot of situations in life require for you to be the bigger person, but most of the time it's not the case at all and you can have as much fun as you want with whatever situation you got yourself involved in. Getting your revenge is one of the best feelings ever, especially when you've been wronged unjustly by a stranger or someone close to you. That's when you feel the universe balancing itself out and after that, life resumes without any complications.
Most of the time, we try our hardest to be as mature as possible and to let things slide whenever we find ourselves in a situation where things could escalate easily. But sometimes it's easier to just be petty.