Why should someone follow the law?

Correction: Why should everybody follow the law?

Anyway if nobody does, you won't be here. Perhaps you got killed by a mugger, or knocked down by a maniac driving at 120mph. So simply speaking, law ensures peace and harmony. And that you'll still be alive to answer "Why should someone follow the law?" :P But also because you would go to jail if you broke the law and ruin your life and no crime is worth that, in my opinion