OR MAYBE I AM GOING TO KILL YOU BECAUSE I'M JEALOUS OF YOUR WIFE OR LOVER, AND I WANT HER FOR MYSELF, SO I'M GOING TO KILL YOU AND THEN TRY TO WOO YOUR WIFE OR LOVER. OR MAYBE YOU SLEPT WITH MY WIFE OR LOVER, AND THIS IS A CRIME OF PASSION AND REVENGE.  OR MAYBE YOU KNOW TOO MUCH ABOUT SOMETHING, AND I'M GOING TO KILL YOU TO COVER SOMETHING UP.  OR...