I saw this on another board and I thought it'd be fun to try here.
The concept is very simple. All you have to do is act offended by what the previous poster said.
Example:
PosterNumberOne: I'm going out tonight
PosterNumberTwo: Yeah, thanks for rubbing in my face that I'm on house arrest and can't go anywhere. **** you, man.
PosterNumberThree: Are you insulting the legal system? Everyone in my family is a police officer. You probably deserve to be on house arrest!
Etc.
All you do is act offended with specific regards to what the previous poster said. Quote the post you're referring to for clarity.
One rule: Mentioning politics, religion or guns gets you one of these:
I'll start things off.
My feet really hurt from all the walking I did today.