Romans 12:19 - Dear friends, never take revenge. Leave that to the righteous anger of God. For the Scriptures say, "I will take revenge; I will pay them back," says the Lord.
On another note, my wife and I had a good laugh at the cat last night. He discovered the cursor moving around on the monitor and thought he could catch it. When he failed at that he used his mighty hunting skills and caught a bug that was flying around. The best part for me was watching my wife get grossed out when he was done playing and decided the bug would make a nice evening snack.