There is an old poem thingy about arguments…

"Raise your words, not your voice. It is rain that grows flowers, not thunder."

Just because you 'win' an argument doesn't mean you've actually won. Ideally if you're in an argument it's because you care and feel strongly enough about a topic and the other person that their opinion on the subject matters to you. 

Of course if you're just arguing with a duche I tend to go with…

"If I waste any more energy arguing with you, I won't have any left to fuck your mother."

But I do like the homicide idea…