I will insult the poster below me . She/He says something witty, and then insults the next poster, who again says something witty and it keeps going and going...

Example:
Person 1: "You hit like a girl"
Person 2: "Aww, I don't see you hitting me back, you overweight cow"
Person 3: "Overweight cow, is that all you got, you tramp"

Start!

"Id love to hug you, but you smell"