My best are neg reps...I guess because I like to piss people off.
"I think now he knows the difference between an asshole and a non-asshole, keep it up!! your pathetic hatred of animals shines right through monkey boy."
"you are BOTH hatefull and mean so piss on you"
"You misplaced your neg rep, butthole ;-)"
"That's right bitch, stay the hell out of Mile High. We don't like your kind here. You want to spend a night in the hospital?"
My favorite positives...
"I didn't understand anything you said, but at least it sounded like you knew WTF you were talking about."
"Freaking hystertical, Ethiopians and Bunnies. 
"