From "Oz: Revenge Is Sweet (#4.11)"
When you take revenge on somebody, you are actually paying them the highest compliment possible. It's like saying, "You've affected my life to such an extent that I must reciprocate. I must affect your life as deeply as you have mine". Revenge may be the ultimate Hallmark card. Yeah. When you think of it like that, the cliché is true. Revenge *is* sweet.