I will add to this as I have time, there are so many to choose from. Please submit your favorites too. I'll start with this one:
jonhill604 - "you're an ignorant mindless biggot, and a fucking psychopath, i hope you get hit by a bus."
sighlent - "why am i a biggot of a psychopath?"
jonhill604 - "Nobody called you a biggot of a psychopath. I called you a psychopathic biggot. Take elementary courses in reading comprehension, and then (maybe) you might not find yourself the fortunate winner of a darwin award."
sighlent - "the R key and the F key are right next to each other, i meant OR... guess you didn't take that into consideration... nor did you offer any explanation. if this were a horror movie and you were black, you'd be dead by now."